Learn to listen. It's not as easy as it seems. For the vast majority of people there is no sound sweeter than your own voice. When you listen to the interlocutor, analyze information and memorize facts, which is trying to get you talking.
Ask and check the information, if you do not understand something or did not hear. Better clarify the situation at once, than to get into an awkward situation. Don't be afraid to offend the interviewee with additional questions. Small refinements only show that you are trying to understand it as best as possible.
Use facial expressions in conversation. Slightly raised eyebrow, the slight smile and a nod of the head will show the person that you are involved in a conversation.
Pause in his speech. Let people digest the information, to speak on the topic of the conversation or ask a question. Don't forget that you are in dialogue, not lecturing. Monotonous, continuous it starts to be boring and irritating after a few minutes.
Do not forget about politeness, even if the person is unpleasant to you, or adheres to the views that you do not share. Remember that your opponent is just as confident in their correctness as you are, and he is free to Express their opinion. Categorical and rude remarks will only show your bad manners and inability to engage in dialogue.
Don't be afraid of pauses. Sometimes, to delve into the content of the conversation and think about just made, it takes time. The ability to eloquently silent have a few. But it, like the ability to listen is an essential quality of the perfect companion.
Communicate competently. Slang, words-parasites, and strong language even in the close circle of friends valid with restrictions. The more competent, smooth and well-built is your speech, the faster you'll deliver their thoughts to the interlocutor.