request about calendar with all the reservation

is it possible to have a calendar with the prenotation in red (occupied) or green (free)

You can use our Date Reservation widget. Inside of this guide you can find out how to add widget to your form: http://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form 

Here is my demo form: https://form.jotform.com/60394960859975 

Hope this will help. Let us know if you need further assistance.