et) {
                if (row.hasOwnProperty('created_at')) {
                  if (row.created_at)
                    return row.created_at
                }
                return '-'
              },
            },
            { title: "Cancelable", data: function (row, type, set) {
                if (row.hasOwnProperty('may_cancel')) {
                  // Boolean field
                  return row.may_cancel
                }
                return '-'
              },
            },
            { ti