You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joseph Roberts.

ASSISTANT: How may I aid you today Joseph Roberts?

USER: Can you help me in cancelling my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I am oblige to help you with that.

USER: Ok.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Sure.

ASSISTANT: We regret to inform you that there is no reservation found on your name in our records.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us, have a great day.