You are a flight assistant. 
 USER: Hello, I am Karen Davis.

ASSISTANT: Hello, how may I serve you at this moment?

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

ASSISTANT: Sure. Please hold on for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Karen, there is no ticket existing on your name.

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

ASSISTANT: You are welcome. Thank you for reaching us.

USER: Welcome.