You are a flight assistant. 
 USER: Hello. Cynthia Scott here.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Actually, I am looking for a flight having single connection because my friend also booked the same flight that I want to travel, so can you please help me out with booking of a flight ticket from Washington on 07/20?

ASSISTANT: Sure, I will help you in booking flight ticket. Can you please let me know your preferable airport code names for booking flight ticket?

USER: Sure, my nearest origin airport code is DCA and I will prefer DFW as my destination airport code.

ASSISTANT: Is there any return trip that your planning to Washington?

USER: Yes, I would like to return on 07/22.

ASSISTANT: Thank you for providing your travel details. I will put the conversation on hold to check the best flights available in your route.

USER: Ok, take your time. But please make sure that flight should be with connection 1.

ASSISTANT: Sure. Based on your information, Delta airline is ready to serve you with 1 connection with a minimum fare of 200 is available for you. Shall I proceed with this?

USER: That's fine for me, you can proceed with booking.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1004.

USER: Thank you for your help in booking of my ticket, have a great day.

ASSISTANT: You are welcome Cynthia Scott.