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.