You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I just want to cancel my recently done reservation, because of postpone of my examination.

ASSISTANT: Sure, can I know your name?

USER: Myself Ronald Green here.

ASSISTANT: Sorry Ronald, there is no reservation on your name.

USER: That's fine. Thank you for your information.

ASSISTANT: You are welcome.