Hi.
Hello, how can I help you?
 I need to book a flight ticket to travel Washington. Could you please assist me checking a flight ticket from IAH to IAD?
Sure, may I know your name please?
Sure, my name is Jason Davis.
Ok, please tell me your planned travelling dates.
My planned dates of journey are from 12/05 to 12/07.
Davis, all flight tickets are sold out in your requested month.
Ok, no problem. Thank you for your information.
Thank you for opting us, have a great day.