code: function buildAvailableTimeString(availabilities) {
      let prefix = 'We have availabilities at ';
      if (availabilities.length > 3) {
          prefix = 'We have plenty of availability, including ';
      }
      prefix += buildTimeOutputString(availabilities[0]);
      if (availabilities.length === 2) {
          return `${prefix} and ${buildTimeOutputString(availabilities[1])}`;
      }
      return `${prefix}, ${buildTimeOutputString(availabilities[1])} and ${buildTimeOutputString(availabilities[2])}`;
  }
docs: Build a string eliciting for a possible time slot among at least two availabilities.