Update app.py

app.py

@@ -443,7 +443,7 @@ class YouTubeChatbotApp(YouTubeChatbot):
         summary_message = f'Here is a summary of the video "{video_title}":'
         self.gradio_chat_history.append((None, summary_message))
         self.gradio_chat_history.append((None, summary))
-        greeting_message = ('You can ask me anything about the video.'
+        greeting_message = ('You can ask me anything about the video. '
                             'I will do my best to answer!')
         self.gradio_chat_history.append((None, greeting_message))
         return self.gradio_chat_history