Hello.
user
Hello. How can I aid you?
assistant
Can you help me to book a flight ticket from DCA to DFW?
user
Sure, may I know the planned travel dates to check for the flight availability?
assistant
My travel dates are Apr 10 and Apr 12.
user
Please provide me the specifications.
assistant
I would like to return back in the afternoon time  and an economy class flight ticket.
user
May I know the name?
assistant
I am William Davis.
user
Sorry, there are no flights are available for your desired intent.
assistant
No problem, thank you for the information.
user
Thank you for reaching us.
assistant