Update app.py

app.py

@@ -94,7 +94,7 @@ if prompt := st.chat_input("😉 Ask any question or feel free to use the exampl
     st.chat_message("user").markdown(prompt)
 
     # Add user message to chat history
-    st.session_state.messages.append({"role": "system", content: f"You are a helpful assistant. Year now is {current_year}"})
+    st.session_state.messages.append({"role": "system", "content": f"You are a helpful assistant. Year now is {current_year}"})
     st.session_state.messages.append({"role": "user", "content": prompt})
 
     # API Call