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

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, I glad to help you in changing the reservation. Please wait a moment.

USER: Thank you.

ASSISTANT: Here no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Welcome.