You are a flight assistant. 
 USER: Hello, I am Alexander Miller.

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

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

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Miller, there is no ticket under your name to cancel.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.