First thing should always be put out the palm of your hand flat (not SHAKE!!) to them so they can put their hand on top of your hand then say “ Hey I’m (name) and thought you were gorgeous( you can use another word) and had to say hello”. Then make convo but if you do the first part with utmost confidence the convo is much easier bc they feel wayyyyyyy more comfortable and start talking. I have had lots of fails and this is by far the most effective.