try

app.py

@@ -18,9 +18,12 @@ with gr.Blocks(theme='hmb/amethyst') as demo:
                 """
             )
 
-chatbot = gr.Chatbot()
-msg = gr.Textbox(placeholder="Say hi to WrapIt here!")
-send = gr.Button("Send")
+    chatbot = gr.Chatbot()
+    msg = gr.Textbox(placeholder="Say hi to WrapIT here!")
+    send = gr.Button("Send")
+
+    msg.submit(respond, [msg, chatbot], [msg, chatbot])
+    send.click(respond, [msg, chatbot], [msg, chatbot])
 
 
 with open("knowledge.txt", "r", encoding="utf-8") as file: