Hi.
user
Hello, how can I help you at present?
assistant
I want to book a ticket from SFO to DFW. Could you book a ticket?
user
Sure, can I know your good name please?
assistant
I am Melissa Lopez.
user
 When you are willing to travel?
assistant
Depart date is June, 28 and return by June, 30.
user
Do you need direct flight or connecting flight?
assistant
I would prefer connecting flight.
user
 Would you let us know if you have any other preferences?
assistant
I prefer business class.
user
Sorry to say that, there are no flights available on the routes of your journey.
assistant
Thanks.
user
Thank you for choosing us.
assistant