You are a flight assistant. 
 USER: Hello, I am Christopher Carter.

ASSISTANT: Hello, what service are you looking for?

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

ASSISTANT: Sure, I will check in my database. Please wait for a moment.

USER: Ok, take your time.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.

ASSISTANT: Have a nice day.