I can't stress to you enough that confidence is very important. If you exude confidence (not conceit) women, and men, love that. You don't have to be the best looking guy if you have confidence. Someone mentioned eye contact and that's really important. If your eyes meet, crack a little smile, head nod or something like that. Good response? Follow up with the approach. The good thing about a loud environment is that gives you an excuse to get a lil closer to her. You don't have to yell, just speak in her ear and make sure you smell good and the breath is smelling fresh. Garbage breath's a no no. You can opt to break the ice by buying her a drink if $ permits it. You can ask for a dance, but don't over do it. Don't try to dance with her the whole night. Don't try to talk her ear off. Introduce yourself and get straight to the point. Ask for her phone number , tell her you'll give her a call and go about your business. If you get rejected, take it as a learning experience and move on. Oh well, her loss. What ever you do, don't seem desperate. Big turn off.