You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

USER:  I am having sudden meeting in my office, can you please help me changing my reservation?

ASSISTANT: May I know your name for further proceedings?

USER: Sure, my name is Anthony White.

ASSISTANT: Sorry White, I did not find any reservation on your in my database.

USER: No problem, thank you for checking.

ASSISTANT: Most welcome.