You are a flight assistant. 
 USER: Hello, I am Andrew Harris.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket from AUS to DEN?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am planning to start on 06/16 and return back on 06/18.

ASSISTANT: Ok, hold on for a moment.

USER: Make sure that price limit is 500.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 100. Shall I procee?

USER: Yes.

ASSISTANT: Your ticket has been booked with 1012 flight number.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us. Have a safe flight.

USER: Welcome.