diff --git a/.gitignore b/.gitignore
index 5ff2aa0..5ef1fa4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ composer.lock
 # phpunit
 .phpunit.cache
 .phpunit.result.cache
+.idea
diff --git a/src/Dialog.php b/src/Dialog.php
index e2d1196..ad176d7 100644
--- a/src/Dialog.php
+++ b/src/Dialog.php
@@ -1,4 +1,5 @@
-<?php declare(strict_types=1);
+<?php
+declare(strict_types=1);
 
 namespace KootLabs\TelegramBotDialogs;
 
@@ -9,7 +10,9 @@
 
 abstract class Dialog
 {
-    protected int $chat_id;
+    protected int $chatId;
+
+    protected int $userId;
 
     /** @var array<string, mixed> Key-value storage to store data between steps. */
     protected array $memory = [];
@@ -29,9 +32,13 @@ abstract class Dialog
     /** @var int|null Index of the next step that set manually using jump() method. */
     private ?int $afterProceedJumpToIndex = null;
 
-    public function __construct(int $chatId, Api $bot = null)
+    public function __construct(Update $update, Api $bot = null)
     {
-        $this->chat_id = $chatId;
+        $message = $update->getMessage();
+
+        $this->chatId = $message->chat->id;
+        $this->userId = $message->from->id;
+
         if ($bot) {
             $this->bot = $bot;
         }
@@ -59,11 +66,11 @@ final public function start(Update $update): void
      */
     final public function proceed(Update $update): void
     {
-         $currentStepIndex = $this->next;
+        $currentStepIndex = $this->next;
 
-         if ($this->isStart()) {
-             $this->beforeAllStep($update);
-         }
+        if ($this->isStart()) {
+            $this->beforeAllStep($update);
+        }
 
         if ($this->isEnd()) {
             $this->afterAllStep($update);
@@ -159,14 +166,12 @@ final protected function forget(string $key): void
         unset($this->memory[$key]);
     }
 
-
     /** Check if Dialog started */
     final public function isStart(): bool
     {
         return $this->next === 0;
     }
 
-
     /** Check if Dialog ended */
     final public function isEnd(): bool
     {
@@ -174,9 +179,14 @@ final public function isEnd(): bool
     }
 
     /** Returns Telegram Chat ID */
-    final public function getChatId(): int
+    final public function getChatId(): ?int
     {
-        return $this->chat_id;
+        return $this->chatId;
+    }
+
+    final public function getUserId(): ?int
+    {
+        return $this->userId;
     }
 
     /** Get a number of seconds to store state of the Dialog after latest activity on it. */
@@ -191,7 +201,7 @@ final public function ttl(): int
      */
     private function proceedConfiguredStep(array $stepConfig, Update $update, int $currentStepIndex): void
     {
-        if (!isset($stepConfig['name'])) {
+        if (! isset($stepConfig['name'])) {
             throw new InvalidDialogStep('Configurable Dialog step does not contain required “name” value.');
         }
 
@@ -200,17 +210,17 @@ private function proceedConfiguredStep(array $stepConfig, Update $update, int $c
         if (isset($stepConfig['response'])) {
             $params = [
                 'chat_id' => $this->getChatId(),
-                'text' => $stepConfig['response'],
+                'text'    => $stepConfig['response'],
             ];
 
-            if (!empty($stepConfig['options'])) {
+            if (! empty($stepConfig['options'])) {
                 $params = array_merge($params, $stepConfig['options']);
             }
 
             $this->bot->sendMessage($params);
         }
 
-        if (!empty($stepConfig['jump'])) {
+        if (! empty($stepConfig['jump'])) {
             $this->jump($stepConfig['jump']);
         }
 
@@ -225,9 +235,15 @@ private function proceedConfiguredStep(array $stepConfig, Update $update, int $c
     public function __serialize(): array
     {
         return [
-            'chat_id' => $this->getChatId(),
-            'next' => $this->next,
+            'chatId' => $this->getChatId(),
+            'userId' => $this->getUserId(),
+            'next'   => $this->next,
             'memory' => $this->memory,
         ];
     }
+
+    public function getDialogKey(): string
+    {
+        return implode('-', [$this->getUserId(), $this->getChatId()]);
+    }
 }
diff --git a/src/DialogManager.php b/src/DialogManager.php
index 77901d0..c45b94f 100644
--- a/src/DialogManager.php
+++ b/src/DialogManager.php
@@ -6,6 +6,7 @@
 use Telegram\Bot\Api;
 use Telegram\Bot\Objects\Message;
 use Telegram\Bot\Objects\Update;
+use Illuminate\Support\Collection;
 
 final class DialogManager
 {
@@ -42,11 +43,9 @@ private function getDialogInstance(Update $update): ?Dialog
             return null;
         }
 
-        $message = $update->getMessage();
-        assert($message instanceof \Telegram\Bot\Objects\Message);
-        $chatId = $message->chat->id;
+        $key = $this->generateDialogKey($update);
 
-        $dialog = $this->readDialogState($chatId);
+        $dialog = $this->readDialogState($key);
         $dialog->setBot($this->bot);
 
         return $dialog;
@@ -67,8 +66,7 @@ public function proceed(Update $update): void
         $dialog->proceed($update);
 
         if ($dialog->isEnd()) {
-            $this->store->delete($dialog->getChatId());
-            $dialog->proceed($update);
+            $this->store->delete($dialog->getDialogKey());
         } else {
             $this->storeDialogState($dialog);
         }
@@ -77,20 +75,25 @@ public function proceed(Update $update): void
     /** Whether Dialog exist for a given Update. */
     public function exists(Update $update): bool
     {
-        $message = $update->getMessage();
-        $chatId = $message instanceof Message ? $message->chat->id : null;
-        return $chatId && $this->store->has($chatId);
+        $key = $this->generateDialogKey($update);
+
+        return $key && $this->store->has($key);
     }
 
     /** Store all Dialog. */
     private function storeDialogState(Dialog $dialog): void
     {
-        $this->store->set($dialog->getChatId(), $dialog, $dialog->ttl());
+        $this->store->set($dialog->getDialogKey(), $dialog, $dialog->ttl());
     }
 
     /** Restore Dialog. */
-    private function readDialogState(int $chatId): Dialog
+    private function readDialogState($key): Dialog
+    {
+        return $this->store->get($key);
+    }
+
+    private function generateDialogKey(Update $update): string
     {
-        return $this->store->get($chatId);
+        return implode('-', [$update->getMessage()->from->id,  $update->getChat()->id]);
     }
 }