Hello. I am Steven Taylor.
user
Hello, how may I serve you?
assistant
I would like to book a flight ticket from DEN to SFO to meet my uncle.
user
Sure, I will help you. Please send your travelling dates.
assistant
My travelling dates are May 1 and May 3.
user
Do you have any preference related to class?
assistant
Yes, I need a business class.
user
May I know your name please?
assistant
I am Steven Taylor.
user
Sorry, there is no flight available with your requirements.
assistant
No worries, thank you for the information.
user
You are welcome, have a nice day.
assistant