You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at this moment?

USER: Raymond White here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: I am glad to help you about that.

USER: Thanks for that.

ASSISTANT: Sorry White, there are no active reservations under your name to change.

USER: Anyway, thanks for the information.

ASSISTANT: Most welcome. Hope you have a nice day.