This AI personal assistant took 3 years and millions to build -- it completely fooled me

A few weeks ago I was emailing Tom Blomfield, the CEO of startup bank Monzo, to arrange lunch. He passed me over to his assistant, Amy Ingram, by CCing her into an email. Amy and I exchanged eight emails fixing up a date and then another five when Blomfield had to rearrange. Only then did I spot something odd in Amy's email signature: "Artificial intelligence for scheduling meetings." It turns out that I had been talking to an algorithm the whole time.