It's nice to teach people new games.
Phil knows how to play a game called Knights and Knaves and Bill doesn't.
Phil wants to talk to Bill.
Phil explains it's simple - Knights always tell the truth and Knaves always lie, you need to use what they tell you to solve the puzzles.
Phil talks to Bill about the wheather because he's too tired to explain a game to Bill.
Bill is excited to try the puzzle game and make a puzzle to stump Phil.
Phil still has no one to play the game with once he finished talking to Bill.