Hi.
user
Hello. How may I guide you?
assistant
William Davis here. Can you cancel my flight ticket reservation? As I want to postpone my business trip in Chicago.
user
Sure, please give me a moment.
assistant
Ok.
user
 I am sorry there is no reservation found for the user name which you have provided.
assistant
Not a problem.
user
Thank you for reaching us, have a nice day.
assistant
Thanks for checking.
user