You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book a flight from IAD to DFW?

ASSISTANT: Sure, let me know your travelling dates.

USER: My travelling dates are 06 and 08 of Dec.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I need a direct flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Donald Hill.

ASSISTANT: We found a direct flight, airline: Delta, flight number: 1012, price: 200.

USER: Please proceed to booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thanks for helping me.

ASSISTANT: Thank you, have a good day.