You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I need to book a flight ticket from DCA to DFW, can you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Sure, my scheduled dates are Jun 3 and Jun 5.

ASSISTANT: May I know your good name please?

USER: Sure, Frank Thompson here.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I am comfortable with any time.

ASSISTANT: We found Southwest airline with economy class and flight number is 1002 with arrival time is 10:00 hours and departure time is 21:00 hours.Shall I proceed for booking?

USER: Yes, you can.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: You are welcome.