You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Nicholas Jones.

ASSISTANT: How can I aid you at this moment?

USER: I want to change my reservation, can you help in that?

ASSISTANT: Sure, I will help you with that. Please hold on a moment, I will check your previous reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation available under your name.

USER: That's ok, thank you for your help.

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