6. Ask getting-to-know-you questions. “What internet sites do you visit regularly?" "What vacation spot would you recommend?” These questions often reveal a hidden passion, which can make for great conversation. I'm working on Before and After, a book about habits, and one side benefit is that I have an excuse to ask people about their good and bad habits, and their answers are inevitably fascinating. Plus people enjoy talking about their habits.
7. React to what a person says in the spirit in which that that comment was offered. If he makes a joke, even if it’s not very funny, try to laugh. If she offers some surprising information (“Did you know that the Harry Potter series have sold more than 450 million copies?”), react with surprise.
8. Be slightly inappropriate.
9. Watch out for the Oppositional Conversational Style. A person with oppositional conversational style (I coined this term) is a person who, in conversation, disagrees with and corrects whatever others say. If you practice this style of conversation, beware: other people often find it deeply annoying.
10. Follow someone’s conversational lead. If someone obviously drops in a reference to a subject, pick up on that thread.
11. Along the same lines, counter-intuitively, don’t try to talk about your favorite topic, because you’ll be tempted to talk too much. This is a strategy that I often fail to follow, but I should follow it. I’ll get preoccupied with a topic -- such as happiness or habits -- and want to talk about it all the time, with everyone I meet, and I have a lot to say.
Hope that provides a foundation - remember people like to talk about themselves so ask them about that, talk about current events (everyone has an opinion - Trump, Ebola, Isis etc) so long as it fits in with the general mood and talk to everyone and anyone - bus drivers, cashiers, waitresses etc