Lost iPhone 4s in Dublin city centre

My iPhone is a 4s it is black and has an Otter Box case on it. The case is a two piece case with a hard shell around a soft gel cover. you can see the apple through the case in the back. If you turn it on the phone will show a picture of me and my girlfriend on the lock screen. I lost the phone between 22:00 October 4th, 2014 and 3:00 October 5th 2014. I know the chances are slim of finding this but please help.