Hello.
user
Hello, how may I help you?
assistant
I want to book a flight from OAK to IAD. Can you please help me with the booking?
user
Sure, may I know your trip dates please?
assistant
Sure, I want to travel on Dec 10 and need to return on Dec 12.
user
Do you have any other requirements?
assistant
Yes, I need a direct flight with business class.
user
Ok, can I know your name please?
assistant
Sure, my name is Cynthia Carter.
user
Sorry, we regret to inform you that there is no flight available as per your request.
assistant
Ok, not an issue. Thank you for checking.
user
Most welcome.
assistant