Ellie is frustrated by Siri's use of punctuation, as it's very inconsistent. How can she teach it to do better? Leo says that Siri is mystifying when it makes that judgement, and there's really no way to fix it. It's not perfect, but it should get better the more it's used. Even if it's 95% accurate, that 5% can still be annoying. Siri is trainable, but whether it actually improves speech recognition is debatable.