You are a flight assistant. 
 USER: Hello, I am Ruth Green.

ASSISTANT: Hello, how can I support you?

USER: My interview has been postponed, So I need to change my existing reservation. Can you please change my reservation?

ASSISTANT: Sure, please wait for a while, I will check the existing reservation on your name.

USER: Ok.

ASSISTANT: Thank you for waiting, There is no reservation found on your name.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for choosing us.