fixed errors

app.py

@@ -4,7 +4,7 @@ from huggingface_hub import InferenceClient
 client = InferenceClient("microsoft/phi-4")
 
 def respond(message,history): #function to return the history of messages sent
-    message[{"role": "system", "content": "You are a friendly chatbot!"}]
+    messages = [{"role": "system", "content": "You are a friendly chatbot!"}]
 
     if history:
         messages.extend(history)