Hi,.
user
Hello, how can I aid you?
assistant
Please book a ticket from Las Vegas, NV-LAS to San Francisco, CA-SFO.
user
Sure, please let me now your travelling dates.
assistant
Travelling dates are from 12/01 to 12/03.
user
May I have your name please?
assistant
I am David Anderson.
user
Sorry for the inconvenience, there are no flights with your requirement.
assistant
Thank you.
user
Have a good day.
assistant