We currently have simple online booking app [url removed, login to view] that allows users to select a time and request an appointment. It is mycal and thickbox. All of the code is writen and feeds our backend system which does not need any modification. It simply does an insert in a mysql database.
Our website is switching to wordpress and we want a simple box similar to http://www.setster.com. Click book a demo appt and it has a nice popup where you can choose a service, loads a pretty calendar with start and end times instead of a dropdown, and shows where you are in the process with a breadcrumb.
There is no backend work. The sql to see available times and insert into the database need to stay the same. This is a project to change what happens on the front end when you click the book button. We never take payment to there is no need for paid services like setster. Just the free service selection -> calendar picker -> data input -> confirmation.