Changes to Actualizar información del asistente del ticket

added the optional property attendee/admittedAt to the response with the 200 status

added the optional property attendee/admittedByName to the response with the 200 status

added the new optional request property cancellationReason

added the required property attendee/cancellationReason to the response with the 200 status

added the required property ticketCount to the response with the 200 status