Hi, I am Debra Lewis.
user
Hello, how could I assist you?
assistant
I need to book a flight ticket from JFK on 09/21 to SFO on 09/23, as I am  going to meet my family on a holiday trip.
user
Just a moment, I will let you know the information.
assistant
Ok.
user
We are very sorry to notify you. Unfortunately no flight found on given details.
assistant
Ok, thank you for your information.
user
Thanks for approaching us.
assistant