You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Barbara Allen here. Can you please help me with booking a flight ticket from IAD to LAS?

ASSISTANT: Sure, please share your planned trip dates.

USER: My planned trip dates are Aug 14 and Aug 16.

ASSISTANT: Let me know your connection limit.\.

USER: I need a connecting flight in my journey.

ASSISTANT: Do you have any other specifications?

USER: I need  to book my ticket in economy class and my departure time should be in the evening.

ASSISTANT: We found an AA airlines with 0 connections and your depart time in the evening. Shall I proceed for booking?

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

ASSISTANT: Your ticket has been confirmed with economy class and flight number is 1000.

USER: Thank you very much in reserving my ticket for the flight-1000.

ASSISTANT: Thank you for choosing us.