Hi. I would like help finding a flight from San Francisco to Chicago.
Can you give me some specifications?
I would like to leave today in the afternoon and return in 4 days.
What seating class do u prefer?
I would like economy.
Do you prefer non stop or layover?
Nonstop.
Any price limit?
No.
Thank you for the information. One moment. I found a flight for you at Virgin Airlines, departs at 4:10 p.m. and arrives at 10:15 p.m. Your return flight  departs at 6:45 p.m. and arrives at 9:30 p.m.
Sounds good. Book it.
Alright, You're all set.