Change response from echo to yes/no

app.py

@@ -1,8 +1,11 @@
 import gradio as gr
+import random
 
 def echo(message, history):
-    return message
+    my_list = ["yes", "no"]
+    return random.choice(my_list) 
+
+chatbot = gr.ChatInterface(echo, type = "messages")
 
-chatbot = gr.ChatInterface(echo)
 
 chatbot.launch()