Hello,.
user
Hello, how can I serve you today?
assistant
Please book a ticket from Dallas & Fort Worth, TX-DFW to Washington DC-IAD.
user
Ok, I can book a ticket for you. May I know your depart and arrival dates?
assistant
Depart is on 12/19. Return date is 12/21.
user
Ok, wait a minute.
assistant
Sure.
user
May I know your name please?
assistant
I am Jack Brown.
user
Sorry, no flights are available for you to your desired locations.
assistant
Thank you.
user
Thanks for communicating with us, have a nice day.
assistant