Hello.
user
Hello. How can I assist you now?
assistant
Can you please help me with booking a flight ticket from IAD to DFW?
user
Sure, I am  happy to help you with that. Can I have your  travel  dates please?
assistant
My travelling dates are from Aug 04-06.
user
Ok,  please  let me know your  preferable timings of your  journey.
assistant
My depart has to be in afternoon.
user
Do you  have any other specifications?
assistant
I would be comfortable with single stop over.
user
Can I have your  good name please?
assistant
Ashley Harris here.
user
Sorry to inform you that no flight is available to you on your  planned dates.
assistant
No problem, thank you for the information.
user
Thank you for choosing us, have a good day.
assistant