You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donald Edwards here.

ASSISTANT: How may I help you?

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

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you that, there are no reservation found on your name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for opting us, have a nice day.