You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Justin Collins. Can you please help me in booking a flight ticket from AUS to LAS to attend an arts festival?

ASSISTANT: I am happy to help you, may I know your trip dates to go?

USER: My planned journey dates are Sept 01 and Sept 03.

ASSISTANT: There is a direct flight-1003 with price 200, shall I confirm it?

USER: I need a business class ticket, can you please check for it?

ASSISTANT: Sorry, there is no flight for you in business class.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thanks for choosing us.