You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at present?

USER: I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure, I am here to help you to change it. Ok,  May I know your good name please?

USER: Patrick Nelson here.

ASSISTANT: Ok, Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that, there was no reservation found on your name to change it.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for approaching us.