Hello.
user
Hello.
assistant
I am Mark Smith.
user
How can I help you?
assistant
I am planning to visit Denver to meet my brother, can you please find a flight from SFO to DEN?
user
Sure, May I know your travelling dates?
assistant
My travelling dates are 08/30 and 09/01.
user
Do you have any preferences?
assistant
I prefer business class.
user
Sorry, There are no flights available under business class.
assistant
That's ok, thank you for checking.
user
Thank you.
assistant