You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Can you aid me in booking a flight ticket from SFO to JFK?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on Feb 10th and return back on Feb 12th.

ASSISTANT: Do you have any airline preference?

USER: Ensure it is in the normal-cost airline.

ASSISTANT: Please wait for a moment.

USER: Ensure it is in the business class.

ASSISTANT: May I know your name?

USER: Myself Barbara White.

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

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

ASSISTANT: You are welcome, have a nice day.