Hi.
user
Hello. How can I help you?
assistant
I am looking for a direct flight from IAD to SFO, can you please help me in booking a flight ticket?
user
Let me know your travelling dates.
assistant
My travelling dates are Sept 18 and Sept 20.
user
Do you have any preference?
assistant
My class preference is business.
user
Can I know your name?
assistant
My name is Margaret Lee.
user
Sorry, no flights found for your travelling dates.
assistant
No problem, thank you for your information.
user
Thank you.
assistant