You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I want to travel to Oakland, to taste the famous food there. So please help me book a flight ticket from PHX.

ASSISTANT: Sure, may I know your destination airport as well as dates of travel please?

USER: Ok, the destination airport code is OAK. The travelling dates are 01/30 and 02/01.

ASSISTANT: Please wait for a moment. Sorry, there is no flight is available as your travelling details. May I know your name please?

USER: It's ok, no problem. My name is Paul Williams.

ASSISTANT: Thank you for your information.

USER: You are welcome.