John worked in an office in a small town. One day his boss said to him, "John, will you go to London and see Mr.Green? Here's the address." John went to London by train. He left the station, and thought, "The office isn't far from the station. I'll find it easily." But after an hour he was still looking for it, so he stopped and asked an old woman. She said, "Walk two blocks along this street, and turn right. You'll find it on your left." John went and found it. A few days later he went to the same city, but again he did not find the office, so he asked someone the way. It was the same old woman! She was very surprised and said, "Are you still looking for that place?"