While the trains of questions being answered is cool, what's more impressive to me is that it has an understanding of the questions that came before. One thing that Siri is good at is the little "make an appointment at 3... *confirm?*, no change it to 3:30" moments. When it works, it's great – but it's obviously nothing like this. Being able to understand the points in the interaction that came earlier brings us much closer to carrying on an actual conversation instead of figuring out what the computer needs to hear.
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