Hi,.
user
Hello. How can I aid you?
assistant
I need a ticket from Las Vegas, NV-LAS to Washington DC-DCA.
user
Sure, I  can help you. Please share me your travelling dates.
assistant
Departure date is 10/26 and 10/28 is my return date.
user
Do you need any connecting flight?
assistant
I need direct flight.
user
May I know your name?
assistant
I am Emily Young.
user
Unfortunately, there are no flights found according to your specifications.
assistant
Thanks.
user
Thank you for choosing us.
assistant