You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need to cancel my recent reservation due to my exam postponed, can you please help me out?

ASSISTANT: May I know your name?

USER: Sure, my name is Paul Moore here.

ASSISTANT:  I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: Ok, not an issue.It might be cancelled before.

ASSISTANT: That's ok, thank you.

USER: Thank you for your information.