You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist 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?

ASSISTANT: Sure, may I know your good name please?

USER: My good name is Margaret Miller.

ASSISTANT: Thanks for providing your name, there is  no reservation on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for choosing us.