You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Emily Moore from Washington. I am planning to do Christmas shopping in Charlotte, so please book a flight ticket from DC - IAD, NC - CLT.

ASSISTANT: Sure, we are willing to help you. May I know your planned dates to travel?

USER: My departure day is 12/10, return day is 12/12.

ASSISTANT: Ok, how much can you afford for this reservation.

USER: My price limit is 500.

ASSISTANT: Ok, please give me a moment to check the availability of flights.

USER: Sure.

ASSISTANT: Thank you for waiting, Spirit airline is available for you with price 100 and a halt in economy class. Shall I proceed with the booking in flight 1019?

USER: You can proceed to booking.

ASSISTANT: Your booking is done on the name Emily Moore.

USER: Thank you for your good service.

ASSISTANT: Thank you for choosing our service.