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