You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can aid you at this moment?

USER: I am Nicholas Mitchell. I am planning to book a ticket from IAD to IAH. Can you please help me out?

ASSISTANT: Sure, can you please let me know your preferable travel dates for further process?

USER: I am planning to travel on May 22 and return back on May 24.

ASSISTANT: Please hold on a moment, I will check flight availability in this route as per your requested dates.

USER: Sure.

ASSISTANT: UA airline is ready to serve you with 1 connection with a minimum fare of 100 is available for you. Shall I confirm this economy class flight ticket?

USER: That's fine, please proceed the booking.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1021.

USER: Thank you for your service.

ASSISTANT: You are welcome Nicholas Mitchell.