You are a flight assistant. 
 USER: Hello, I am George Davis.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure. Please let me a moment to check the possibility.

USER: Ok, hold on for a moment.

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

USER: That's ok, thank you.

ASSISTANT: Welcome. Thank you for reaching us.

USER: Welcome.