How Artificial Intelligence is different from human reasoning

The man walking toward me on the street looks like Bob, a friend of mine. As he continues to walk toward me, I decide he is Bob, my friend. I say --Hi, Bob-- and he returns his greeting the same way --Hey, Sam. This conversation exchange is repeated millions of times every day all over the world in English, German, French, Italian and so on. Now let us change the situation a bit.