Hello, myself Richard Jones.
Hello, how may I assist you?
I am planning to book a flight ticket to SFO from LGA, can you please help me out?
Sure, may I know your planned travel dates please?
Sure, my planned travelling dates are May 17 and 19.
Would you like to prefer direct flight or connecting flight?
I prefer 1 connected flight.
Would you like to prefer direct flight or connecting flight? Do you have any particular time for departing and returning?
Yes, my return time must be in evening.
 Which class do you prefer?
I prefer economy class.
Sorry, there is no flight available in this route.
It's ok, thank you for the information.
You are welcome.