Hello. I am William Miller.
Hello, how may I aid you today?
Can you help me in booking my flight ticket from DFW to IAD?
Sure, can you mention your travel dates?
My trip dates will be Dec 21st to Dec 23rd.
Do you need a stopover?
I need a connecting flight.
 May I know if you want any specific time for your departure and return?
My return time should be in the evening.
Is there any class preference for you?
I prefer a economy class.
Do you have any other specifications?
No.
Sorry to say that, there are no flights available on the routes of your journey.
Its ok, thank you.
Thank you for choosing us.