Have a purpose behind everything you say, do not talk simply to hear your own voice. You should be asking people questions, or you should be talking about topics relevant to the conversation. You do not want to simply talk and talk and talk under the impression that it will cause people to think you are all knowing or something. The more you talk, the more it gives chance for people to ignore you, and think of reasons to disqualify you. If you think about what you are going to say, and speak with purpose, you can have the people around you talking and engaging you in conversation, thus they are trying to qualify themselves to you. This will make your life far simpler, and you are far less likely to lose someones attention.
--Mission
--Mission