Hello, I am Joseph Young.
Hello, How can I help you?
I want to book a flight from DCA to DFW as I want to attend to my brother's birthday.
Sure, Can you provide me your travel dates?
OK. Travelling dates are from 05/13 to  05/15 and price limit is 200.
Please wait a moment, I will check and get back to you.
Sure.
Thanks for waiting, Unfortunately no flights on your requested dates.
OK, thanks for the information.
Thank you for reaching us, Have a great day.