Hi. I am Benjamin Harris.
Hello, how can I help you today?
I want to book a flight ticket from IAD to LAS, can you help me with booking please?
Sure, may I know your planned travel dates?
My travelling dates are 03/21 and 03/23.
Is there any class preference for you?
No.
May I know your connection limit?
Yes, I need a connecting flight.
Do you have any other specifications?
I want to return at afternoon.
May I know your airline preference?
I don't have airline preference.
Please wait for a moment.
Ok.
Sorry to say that, no flights were found with your given details.
  That's ok, thank you for the response.
Thank you for reaching us.