You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I would like to change my reservation due to postpone of my reporting date in my head office for a seminar. I request you to please change my reservation.

ASSISTANT: May I know your name?

USER: Sure, reservation was done by the name Michael Carter.

ASSISTANT: Please wait for a moment, let me check and back to you.

USER: Sure.

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

USER: Fine, thank you.

ASSISTANT: Thank you, have a nice day.