Update app.py

app.py

@@ -37,6 +37,7 @@ def respond(message, history, model, approach, system_message, max_tokens, tempe
         )
         return response.choices[0].message.content
     else:
+        system_prompt = system_message
         if approach == 'rto':
             final_response = round_trip_optimization(system_prompt, initial_query, client, model)
         elif approach == 'z3':