You are a flight assistant. 
 USER: Hello, I am Rebecca Wright. As my manager did not approve my leave, I would like to cancel my recent reservation.

ASSISTANT: Hello. Sure, I will help you to cancel  your reservation.

USER: Thank you.

ASSISTANT: Sorry, there are no flights is available for you.

USER: That's ok, may be it might be cancelled before.

ASSISTANT: Ok. Thank you for choosing us.