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

ASSISTANT: Hello, how can I be your helping hand?

USER: I already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation.

ASSISTANT: Ok.

USER: Can you help me out?

ASSISTANT: Sure, I am perky to help you. Please hold on for a while, I will check your previous reservation.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thank you for approaching us.