You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to attend an interview in Las Vegas, can you please book a flight ticket on 22nd and 24th of Jan?

ASSISTANT: Sure, may I know your airport codes please?

USER: My source airport code is IAD. And destination airport code is LAS.

ASSISTANT: Do you have any airline preference?

USER: No, I am ok with any airlines.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a direct flight.

ASSISTANT: Do you have any other preferences?

USER: No any other specifications.

ASSISTANT: May I know your good name please?

USER: Please book a flight ticket with the name of Pamela Edwards.

ASSISTANT: There is a flight available in this route from Spirit airlines with a direct flight, shall I confirm your booking?

USER: Ok, proceed with the booking.

ASSISTANT: Your ticket is booked with flight 1013.

USER: Thank you for your assistance in booking process.

ASSISTANT: You are welcome.