OH NO.. A Flat

So a few days ago after coming home from work I noticed my back wheel had a flat tire. I thought to myself okay “I need to hit up the bike shop to put some air in my tire”. The next day I go to the shop to get air put in by using compressor to store the air. That night I noticed the back tire was flat once again. In the morning I took the bike to the shop and asked one of the maintenance guy to look at it and he told me that the problem was a slow-leak.