Update app.py

app.py

@@ -37,7 +37,7 @@ async def chat(request: ChatRequest):
                 model="gemini-2.0-flash",
                 contents=messages,
                 config=GenerateContentConfig(
-                    system_instruction=[system_message]
+                    system_instruction=[request.system_message]
                 ),
             )
             return {"response": response.text}