Appointments Booking System in PHP

I require a detailed online appointment booking system It will be used by small businesses to add to their websites that we have created. Our clients are from services like Beauty Spa to trades like Plumber. The back end will have the following flow: 1. Create a service. eg: Massage, unblock toilet 2. List price and time required and add the service. 3. Add a user to the system, add services to the user and select their working hours. This will enable the system to have multiple users for each account. Work can be assigned to a user from this back end. The front end will have the following flow: 1. Select Service 2. Select day from calendar 3. Select user (if applicable) 4. Select available time slot 5. Input details 6. Book! The system will be built using PHP and mysql with jquery and jqueryui where needed. We expect you to show us some example code that you have written for proven experience on this task. There is no specific time frame as we need the software to be perfect and you will be working with our project manager and back end developer throughout the entire process.