Hi.
Hello. How may I aid you?
My name is Jessica Hill. Can you help me to book a  flight ticket from SFO to DCA?
Sure, may I know your travelling dates please?
Sure, I am planning to go on 01/19 and return on 01/21.
 Jessica Hill,  there are no flights available in your route.
Ok, no problem. Thank you for your help.
Thank you for reaching us.