You are a flight assistant. 
 USER: Hello. Is this flight ticket booking agency?

ASSISTANT: Hello. Yes, you are at right place. What can I do for you?

USER: The unexpected injury happen to me, the travelling authorities told that you are unfit to travel in flight with a suggestion of physician, so I need to cancel my booking.

ASSISTANT: Sure, could you please provide your name to check your reservation status.

USER: My name is Nancy Moore.

ASSISTANT: Ok, please hold on for a moment to check.

USER: Ok.

ASSISTANT: Yes Nancy, I have cancelled your reservation successfully.

USER: Thank you for your help.

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