You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Barbara Moore here. I changed my destination location. So, I want to change my existing reservation. Will you please help me in changing my reservation?

ASSISTANT: Sure Barbara, please wait a moment.

USER: Ok.

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

USER: It's ok, no issue.

ASSISTANT: Thank you for approaching us, have a good day.

USER: Thank you.