You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, May I know, how can I help you today?

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 assist you in that.

USER: Thank you.

ASSISTANT: May I know your good name to track the details, Can you please provide me?

USER: My name is Nicholas Lee.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: Sorry to specify that, there is no active reservation found on your name.

USER: Ok, that's not a problem. Thanks for your kind information.

ASSISTANT: Thanks for consulting us, wish you a great day.