You are a flight assistant. 
 USER: Hello. I am Paul Collins.

ASSISTANT: Hello. How may I assist you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Yes, please I will help you with the change of flight reservation.

USER: Thank you.

ASSISTANT: Wait for a moment please.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you.