Two startup personal assistants have venture capitalists in a tizzy right now: Town, the affable enterprise personal assistant, is in talks to raise at a $1 billion valuation in a round led by Index, sources tell us. The corporate personal assistant, started by former Plaid CTO Jean-Denis Greze and former Google applied AI product director Tony Vincent, received earlier backing from Andreessen Horowitz and Forerunner. Meanwhile, Instinct, the text-based consumer personal assistant run by the com...