Reservation Schedule for Spa in PHP

The project is for a booking schedule for a spa. Developed in PHP and MySQL, is should list services down the y-axis and times across the x-axis of a grid or table. The visitor will be able to see what times are available and when they click on an available time they should be able to reserve a time. The reservation will mark the times in a pending color or indication and the reservation will be recorded in the DB as well as an email will be sent to the contact address. Ajax would be a plus. A module in Drupal would be preferred, but custom code is expected.