How to cancel service activity on button click event and making same time slot available for next booking using javascript in MS Dynamics CRM 2016?

I have written script for cancellation of service activity on button click event like this

function CancelServiceActivities(ids,control)
{
    var confirmation = confirm("Are you to cancel the selected appointment(s) ?");
    if (confirmation == true)
    {
        var comments = prompt("Please enter valid reason");
        if (comments == "" || comments == null)
        {
            alert("Invalid reason entered. Please click on Cancel appointment and enter valid reason.");
            return;
        }

        for (var i = 0; i < ids.length; i++) {
            var id = ids[i].replace("{", "").replace("}", "");
            UpdateServiceRemarks(id, comments);
        }
        control.refresh();
    }
}

but with this script activity got cancelled in status but when I tried to book another activity for same slot it give me error like" this slot is already booked for some other activity "