Well basically what I do is don't necessarily go in for the kill straight away. For example, talk to the person about nothing really eg, what drink are you drinking? Or do you come here often? Then I would carry the conversation on and if you know they are interested then start complimenting them and then maybe ask them out/ask for number . These techniques usually work if you don't seem too nervous and just relax and take your time. Remember, he's a human being just like you Hope this helps and thanks for sharing your thoughts