You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Due to postpone of my exam, I would like to cancel my reservation. Can you cancel my reservation?

ASSISTANT: Sure, may I know your good name?

USER: Check the details on Cynthia Martin.

ASSISTANT: I am sorry Martin, there is no reservation found with your name to cancel.

USER: That's ok. Thank you for your help.

ASSISTANT: It's my pleasure.