You get to the office and tell the receptionist Happy Valentine's Day.
She tells you she doesn't have a Valentine so it's not going to be a happy day for her.
At lunch you stop at a store and buy her a small box of good chocolate and give it to her when you return to the office.
She accepts it and tells you thank you.
You go to the lobby later to greet a visitor, you notice the unopened box of chocolates in the trash by the receptionists desk.