You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Prepone plan came into a picture owing to an announcement of birth of baby boy. So I need to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Nancy Lopez.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to inform you that we didn't find any reservation on your name.

USER: That's not a problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thanks for your information.