You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

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. Can you help me to change it?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Sure, you can check my reservation on the name of Gary Mitchell.

ASSISTANT: Please wait for a moment, while I check for the reservation on your name.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for reaching us, we hope see you again.