You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, may I know your name to check the status and revert you?

USER: Myself Nicole Phillips.

ASSISTANT: Ok, please allow me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting Nicole Phillips, there is no reservation found by your name in our data base.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.