Hello.
Hello. How can I help you?
I need to book a flight ticket, could you help me out?
Sure, may I know the travelling details of your journey?
Sure, I would like to travel from SEA to DFW.
What  were the travelling dates of your journey?
My travelling dates are 12/14 and 12/16.
OK, please wait for a moment.
OK.
May I know your name for booking the ticket?
My name is Gregory Brown.
OK Gregory, there is no flight found on your requirements.
Oh! that's fine.
Thank you.