You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Anna Robinson here.

ASSISTANT: How can I help you at this moment?

USER: I am planning to visit Washington for a business meeting, can you please help me out with booking of a flight ticket from AUS to DCA?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates for booking flight ticket?

USER: Thank you, my departure is on Aug 20 and please book my return ticket also on Aug 22.

ASSISTANT: Do you have any specifications?

USER: Yes, please book my return ticket at the time of evening.

ASSISTANT: Ok, please wait a moment, I will check flight availability in this route as per your requested dates.

USER: Sure, take your time but try to bring a best flight on my route.

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

USER: I am ok with this flight, you can proceed with booking now.

ASSISTANT: Your flight ticket is booked,  flight number is 1015.

USER: Thank you for your kind assistance.

ASSISTANT: You are welcome Anna Robinson.