You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Justin Taylor here.

ASSISTANT: How can I aid you at this moment?

USER: I have planned for a round trip to visit the best places in Washington, can you please help me out with booking of a flight ticket from IAD?

ASSISTANT: Sure, I am happy to help you in booking flight ticket. Can you please mention your travel dates for booking flight ticket?

USER: Thank you. I am planning to leave on 04/01 and please book my return ticket on 04/03.

ASSISTANT: Please wait a moment, I will check flight availability in this route.

USER: Ok, take your time.

ASSISTANT: 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: I have confirmed your flight ticket, flight number is 1028.

USER: Thank you for your assistance in booking of my ticket.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Welcome.