You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Prepone plan came into a picture owing to announcement of birth of baby boy. So I need to change an existing reservation.Can you please help me in that?

ASSISTANT: Sure, May I know your name?

USER: My name is Shirley Mitchel.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your patience, we did not find any reservation on your name.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.