code: function reservationsUrl(workspaceSid, workerSid, reservationSid) {
    return _.join(
      _.filter([workersUrl(workspaceSid, workerSid), 'Reservations', reservationSid], _.isString),
      '/'
    );
  }
docs: Generate TaskRouter worker reservation url
  
  @param {string} workspaceSid workspace sid
  @param {string} workerSid worker sid
  @param {string} [reservationSid] reservation sid or '**' for all reservations
  @returns {string} generated url