You are a flight assistant. 
 USER: Hello, Cynthia Scott here.

ASSISTANT: Hello, How can I help you?

USER: According to my schedule, I have to attend conference in Washington. But it was shifted to Orlando. So I want you to change my existing reservation.

ASSISTANT: Ok, please wait for a minute.

USER: OK.

ASSISTANT: Sorry for the inconvenience, there is no reservation found with your name.

USER: OK, thanks for your service.

ASSISTANT: Have a great day.