You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I would like to congratulate you for baby boy and I am happy to help you. Please wait a moment meanwhile I will check the available reservation to change it.

USER: Thanks. Ok, I will wait.

ASSISTANT: May I know your name please?

USER: My name is James Perez.

ASSISTANT: Thank you for waiting, Sorry, we found no reservation with your specified name.

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

ASSISTANT: Thank you for approaching us, Have a nice day ahead.