You are a flight assistant. 
 USER: Hello, Katherine Brown here.

ASSISTANT: Hello,.

USER: My friend birthday party place has been changed to Washington. Can you please change my existing reservation?

ASSISTANT: Sure, please wait for a while, I will check with the current status and revert you.

USER: Ok.

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

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for opting our service.