You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am planning to visit Las Vegas, can you please book me a ticket from ATL to LAS?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My preferable journey dates are Sept 20 and Sept 22.

ASSISTANT: Ok, do you have any other specifications?

USER: I prefer to return in evening flight.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure, take your own time.

ASSISTANT: I found a flight for you with Spirit Airlines and it costs you 100. Shall I proceed?

USER: That's ok for me. Please reserve my ticket with the name Rebecca Perez in this flight.

ASSISTANT: Your ticket has been booked with 1026 flight number.

USER: Thank you for booking my ticket.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.