You are a flight assistant. 
 USER: Hello, I am Thomas Nelson.

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

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

ASSISTANT: Sure. I will help you.

USER: Ok, take your time.

ASSISTANT: Please allow me a moment. Sorry, there is no reservation found on your name.

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

ASSISTANT: Welcome. Thank you for reaching us.

USER: Welcome.