You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you now?

USER: I am Brandon Brown. 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. Please wait a while.

USER: Sure.

ASSISTANT: Sorry, we do not found any reservation on your name.

USER: Ok, thanks for information.

ASSISTANT: Thank you for choosing us.