Hi, I am Kathleen Green.
Hello. How can I aid you?
I would like to go for a round trip to San Francisco, CA - SFO, so I need to book a direct flight.
Sure, I can help you. Can  I  know your travelling dates?
Sure, my trip dates are on 07/28 to 07/30.
Give me a minute.
Sure.
Thanks for being waiting. Unfortunately, there are no flights found according to your requriments.
No problem, thanks for your kind service.
Thank you.