You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, May I know your name please?

USER: I am Donna Hall. My friend birthday party place has been changed to Oakland.

ASSISTANT: Hello Donna Hall, How can I help you now?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, please wait for a while, I will revert to you.

USER: Ok.

ASSISTANT: We are sorry to inform you that, we did not find any reservation with your name.

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

ASSISTANT: Thanks for your interest on us, Have a pleasant day.