The two women are friends.  the one who's face we can see is telling a story about a man who was waiting to get on a bus, and the bus just passed him by.  The man tried to chase down the bus.  the driver clearly knew the man was trying to catch the bus, but drove on anyways.  This is a very interesting situation because the man in the background just so happens to be the man who chased down the bus.  he is about to interject and exclaim how he doesnt understand why the driver didn't stop.  The woman telling the story will be slightly embarrassed and surprised to find the man listening in.  They will laugh about how strange the event was and the likelihood of them meeting later that day at a restaurant.  after the laughs, the man bids the women good afternoon and pays for their meal.
