Hi.
user
Hello. How can I help you?
assistant
 I want to change me existing reservation as I am very busy for next few weeks, can you please help?
user
Sure, I will help you. May I know your name please?
assistant
Myself Jason King.
user
Sorry to say, there is no reservation on your name in our database.
assistant
Ok, thanks for checking.
user
Thank you for opting us.
assistant