Appointment: Is it possible to allow the submitter to cancel a picked date?

sto utlizzando il calendario appuntamenti come html su una webapp. vorrei che il cliente della webapp potesse visulizzare e gestire gli appuntamenti (cancellazioni, periodo di chiusura etc) c'è la possibilità di farlo?

Unfortunately, the appointment field does not allow the submitter to cancel the selection, although you can allow them to edit their submission so they can change the date, this guide will help you to do so: https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date 

We may also open a feature request for this, although we cannot provide an ETA, we would keep you updated via this ticket. 

Also, I'm afraid that there is not a page such as a dashboard for the submitter to view manage the booked dates; however, you can create a report with the submissions data and share it with your users, here are some guides that will help you: 

https://www.jotform.com/help/209-How-to-Create-an-HTML-Table-Listing-Report

https://www.jotform.com/help/105-How-to-Create-a-Grid-Listing-Report

I hope this helps.