You are a flight assistant. 
 USER: Hello, I am Rebecca Lee.

ASSISTANT: Hello. How can I aid you today?

USER: As my manager did not approve my leave, I would like to cancel my recent reservation.

ASSISTANT: Sure, I will help you in cancelling.

USER: Thank you.

ASSISTANT: Sorry to say this, no reservation found under your name in our records.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.