You are a flight assistant. 
 USER: Hello, I am Joseph Mitchell.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure. Please wait for a while, I will check your ticket's details.

USER: Sure, take your time.

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

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

ASSISTANT: You are welcome, have a nice day.