Dream

I have dreamed that something will happen in the future. For example, I have dreamed that I am talking with somebody or doing something a few weeks or a few months later. So when I am at the timing, I fell familiar about my action, disscussion, the person, and the surrounding. Although the dreams don't include bad events, I would like to know the meanings about the dreams. Why do I know what will happen in the future? If I can find the answer, perhaps can tell people what accident will happen and prevent it. Or I have the prediction ability.