If Patty plays Three Questions with the nurse after work (for the nurse, that is) one day, both question and replies, and any related chit-chat, would give us who they are. I can see one of them proposing the game and the other accepting, but I'm not sure how it ends. Could lead to other times and places, other characters.
(Speaking of characters, today I thought of cutting to six--Patty, the Janitor, her Parents, the Flaneur, and the Nurse--plus a chorus/ensemble of three or four. They could do all the songs, convey all the movement, deliver the stories, create the future, love. Maybe.)
What would happen is that one of them, probably the Nurse, would get distracted and end up looking out a window. Patty should have stopped a question or two sooner.