Magento can be great solution in field of software for reservation of a products or events. The most used eshop platform in community edition is free and Bookme can be the most valuable extension for your booking business. To handle day range of reservation there is a calendar component for customer. This calendar is fully AJAX based so in every time it displays only actual information about availability. Options with new price rules for booking products makes this solution just more powerful. Check simple video tutorials on https://www.youtube.com/watch?v=a_UnxO-Y1hw.