You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER:  I need to cancel my recent existing reservation due to postpone of NBA playoff finals. Can you cancel my reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Matthew Martin.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name to cancel.

USER: Ok, not an issue. Thanks for the wonderful service.

ASSISTANT: Thank you for approaching us, have a good day.