Dear Nikola, I asked a question a few weeks ago about the time slots not showing. Where the time slots should open, there is a message that says "Please select another date." The drop down menus aren't working properly either. You mentioned there might be a problem with the Jquery. Just wondering if you had a chance to figure out why this won't work? Here is a link to my appointment page. Thank you! Beautiful, elegant plug-in! 
Heather https://airportanimalhospitaltoledo.com/appointment/