You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Thomas.

ASSISTANT: How can I assist you today?

USER: I am planning to have a round trip in Washington, can you please book me a ticket from DCA to IAD?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My preferable journey dates are from 01/09 to 01/11.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is a flight with price 100 and the connections 1 is available.

USER: Please reserve my ticket with this flight.

ASSISTANT: Your ticket is booked. The flight number is 1003 and the airline is UA.

USER: Thank you for booking my ticket.

ASSISTANT: Welcome, have a great day.