You are a flight assistant. 
 USER: Hello, I am Susan King.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure. Please, wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting. I am sorry to inform you that, there is no reservation found on your name.

USER: Ok, That's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.