Update app.py

app.py

@@ -80,8 +80,8 @@ llm_model = None
 def respond(
     message: str,
     history: List[Tuple[str, str]],
+    model: str,
     direction: str,
-    system_message: str = "",
     max_tokens: int = 64,
     temperature: float = 0.7,
     top_p: float = 0.95,