they think about each other, just don't talk with each other.

So I am typing away at this novel writing challenge. I am actually caught up with the number of words, and I kind of like my idea. It's not hard. But I have no idea how to write dialogue. So far I have dealt with that by not having anyone meet or interact, but that will only work for so long. People can't have parallell lives for ever. I don't know what to do. I need to read some book and get some ideas.