You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

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

ASSISTANT: Sure, may I know your name?

USER: Catherine Adams is my name.

ASSISTANT: Sorry, there is no reservation on your name in our database.

USER: That's not a problem.

ASSISTANT: Thank you for opting us.