Bookings — Zingiri
http://www.zingiri.net/plugins-and-addons/bookings
The #Bookings #WordPress plugin allows you to provide online booking services for your site. Whether you’re running a Beauty salon, Spa, Hairdresser, Massage therapy, Acupuncture or providing hotel rooms, visitors to your site will be able to check availability of your service and make online bookings.
http://www.zingiri.net/wordpress/wp-content/uploads/bookings-245x245.png