You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Prepone plan came into a picture owing to an announcement of birth of baby boy. So I need your help to change my existing reservation.

ASSISTANT: Sure, I am here to help you in changing. May I know your name?

USER: My name is Margaret Thompson.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in my records.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.