You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

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: Sure, we are here to make your work ease.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, you can check my reservation on the name of Brandon Miller.

ASSISTANT: Ok, just a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to say that no reservation was found on your name in our database.

USER: No worries, thanks for your help.

ASSISTANT: Thank you for selecting us.