You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to visit Detroit from Washington, can you help me in booking the flight ticket?

ASSISTANT: Sure, may I know your trip dates?

USER: My preferable travel dates are from 08/21 till 08/23.

ASSISTANT: Can you please provide me your source and destination airport codes?

USER: My source and destination are IAD and DTW.

ASSISTANT: May I know your name please?

USER: Myself Jerry Wright.

ASSISTANT: Jerry, flight-1001 in Southwest airlines is available and the ticket costs you 200 only. Can I book the ticket?

USER: Please proceed with it.

ASSISTANT: Your ticket is booked successfully. Happy journey.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.