Hi. I am David Rodriguez.
Hello, what can I do for you today?
 I would like to visit an arts expo at Washington. Can you book me a flight ticket from DEN?
Sure, may I know your destination airport code?
My destination airport code is DCA.
Can I know your travelling dates, please?
I am willing to travel on Oct 25 and return on Oct 27.
Do you have any specifications?
Price should not exceed 200.
Thank you for providing all the necessary details, please stand by I will check and revert to you.
Sure.
We have found a connecting flight of AA airline, flight number-1007 and fare 100. Shall I reserve your ticket?
Please, proceed.
Your ticket has been reserved.
Thank you.
Thank you for approaching us.