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