Hi.
user
Hello, how can I help you?
assistant
I want to book a ticket from SEA to DCA. Could you book a ticket?
user
Sure, please provide me your planned travel dates.
assistant
Travel dates are 07/26 and 07/28.
user
Do you prefer either economy or business class?
assistant
I would like to prefer business class.
user
Do you have any other preference?
assistant
I would like to depart in the afternoon time.
user
Sure, may I  know your name please?
assistant
My name is Michelle Carter.
user
We don't have any flight available for your journey.
assistant
Thank you.
user