You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you aid me in booking a flight ticket from PHX to SEA?

ASSISTANT: Sure, please send your travelling dates.

USER: Sure, I would like to go on Sept 03rd and return back on Sept 05th.

ASSISTANT: Do you have any class preference?

USER: Ensure it is in the business class.

ASSISTANT: May I know your name?

USER: Myself Samuel Young.

ASSISTANT: Sorry, there is no flight available on your travelling dates.

USER: That's ok, thank you for checking the availability.

ASSISTANT: You are welcome, have a nice day.