Update app.py

app.py

@@ -152,7 +152,7 @@ if user_message := st.chat_input("Enter message"):
     # Add user message to chat history
     st.session_state.messages.append({"role": "user", "content": user_message})
 
-    response = handle_submission
+    response = handle_submission()
     # Display the agent's response
     ## https://docs.streamlit.io/library/cheatsheet
     with st.chat_message("assistant"):