Hi.
Hello, how may I assist you?
My name is Deborah Turner. I want to book a ticket  to attend a meeting in DCA from IAH, please can you help me to book a ticket?
Yes, sure. Could you let me know your travel dates?
My travelling dates are 02/21 to 02/23.
Sorry, Deborah Turner there is no flight on your preferable dates. Thank you for choosing your service.
It's ok.
Bye.
Thank you for providing  the information.
Your welcome.