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

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

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

ASSISTANT: Please wait for a moment, I will check. Sorry, there is no reservation showing on your name.

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

ASSISTANT: Welcome. Thank you for reaching us.