You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi,. How may I serve you today?

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 in that?

ASSISTANT: Surely,May I know your name?

USER: My name is Linda Clark.

ASSISTANT: Give me a minute to check.

USER: Sure.

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

USER: That's not a problem.

ASSISTANT: Thank you for choosing your service.

USER: Thanks for your kind information.