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