Hi.
Hello.
Robert Parker here.
 Robert Parker, how may I assist you today?
I would like to travel DCA for attending client meeting over there. Please, assist me to book a flight ticket from DEN.
Sure, I can assist you with that. May I know your dates of travel?
Ok, my travelling dates are from 07/19 to 07/21.
Please wait for while, let me check  for the flights availability.
Sure.
Sorry to say that, there are no flights available on your route as per your given travel dates.
Ok, no problem. Thank you for your help.
Thank you for reaching us, have a great day.