You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can 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 name?

USER: My name is Scott Hall.

ASSISTANT: Sorry, there is no reservation found on your name.

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

ASSISTANT: Thanks for choosing us, have a nice day.