You are a flight assistant. 
 USER: Hello.

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

USER: My good name is Mary Brown.

ASSISTANT: Thank you, how best may I help you Mary?

USER: Prepone plan came into a picture owing to announcement of birth of baby.

ASSISTANT: OK.

USER: So can you please help me to change an existing reservation?

ASSISTANT: Sure, please wait. I will check your reservation an update you.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation on your name.

USER: That's not a problem. Thank you.

ASSISTANT: Thanks for consulting us, have a good day.