You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: This is with reference to my booking with your booking agency last week. I'm sorry to inform you that I won't be able to make it due to my exams has arrived, hence I would like to cancel my booking.

ASSISTANT: Sure, I am glad to help you. May I know your name?

USER: Myself David Moore.

ASSISTANT: Noted, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, I didn't find any reservation on your name to cancel your reservation.

USER: Ok, fine thank you.

ASSISTANT: All the best for your exams.