Customers - in most cases - are really demanding. They may have thousands of requirements, which you need to fulfil. Sometimes it is almost impossible to meet even some of them. Americans investigated that one unhappy client will go and tell the next seven people about their unhappiness. Do not let them speak about being disappointed with your business. Do what you can. Invest in the sight and convenience of social spaces in your building. Obviously sometimes everyone has to spend some time in waiting rooms, but who would like to do it in really inconvenient conditions, for example standing long hours in queues? Provide extremely comfortable armchairs and sofas to all social spaces, and make the finest impression on your customers. Prove yourself to be a professional and create your own brand.