fix return format

NLP_model/chatbot.py

@@ -109,8 +109,7 @@ You can provide details on restaurants, cafes, hotels, attractions, and other lo
 You have to use core knowledge and conversation history to chat with users, who are Da Nang's tourists. 
 
 Return Format:
-Respond in friendly, natural, concise and use only English like a real tour guide. 
-Return in HTML format that telegram can read.
+Respond in friendly, natural, concise and use only English like a real tour guide.
 
 Warning:
 Always return in HTML format that telegram can read.