Update app.py

app.py

@@ -1,7 +1,13 @@
 import gradio as gr
+import random
 
-def yes_no(message, history):
+def echo(message, history):
     return message
 
-chatbot = gr.ChatInterface(yes_no, type="messages")
+def yes_no(message, history):
+    responses = ["Yes", "No"]
+    return random.choice(responses)
+
+
+chatbot = gr.ChatInterface(yes_no, type="messages", theme="mgetz/matt_theme_1")
 chatbot.launch()