Hi.
Hello.
I am Richard Scott.
How may I help you today?
  I am very excited as this trip is very special, I am going to hangout with my school friends after a long time.Can you please book a ticket from DCA to IAH? My travelling dates are 04/23 to 04/25.
Ok, please wait a moment.
Take your time.
Sorry Scott, there are no flights had been found on your details.
Sorry, there is no flight available.
Thank you for reaching us.Have a nice day.