Update chatbot.py

chatbot.py

@@ -17,7 +17,8 @@ class Comsatsbot:
 
 
         # Initialize memory buffer and MongoDB connection
-        self.memory = ConversationTokenBufferMemory(llm=self.llm, max_token_limit=3000)
+        self.memory = ConversationTokenBufferMemory(llm=self.llm, max_token_limit=3000, memory_key="chat_history",  # optional but recommended
+    return_messages=True        # optional, depends on your chain)
         self.chats_collection = chats_collection
         self.index_path = index_path
         self.hf = hf