working but no chat layout

app.py

@@ -82,8 +82,7 @@ def greet(question, pdf_file):
     else:
         return "No helpful answer found."
 
-# iface = gr.Interface(fn=greet, inputs=["text", "file"], outputs="text")
-iface = gr.ChatInterface(greet)
+iface = gr.Interface(fn=greet, inputs=["text", "file"], outputs="text")
 iface.launch(share=True)