Hi.
Hello, do you need any help from us?
I am Christopher Clark. I want to participate in marathon, so please book my ticket from SFO to JFK.
Sure, could you please share your departure and arrival day?
My travelling dates are Aug 1 to Aug 3.
 The economy class with flight number 1023 of Delta airline is available having connection as 1 and fare as 100, is it ok for you?
I need a connecting flight which returns at evening.
JetBlue airline with flight number 1021 is available.
You can book it.
Ok, your reservation is confirmed.
Thank you.
You are welcome, have a great day.