code: function(messageId, conversationId, callback) {
        if (!messageId) return callback(new Error(utils.i18n.messages.mid));
        messageId = utils.toUUID(messageId);
        if (!conversationId) return callback(new Error(utils.i18n.conversations.id));
        conversationId = utils.toUUID(conversationId);
        utils.debug('Message get: ' + messageId + ', ' + conversationId);
        request.get({
          path: '/conversations/' + conversationId + '/messages/' + messageId
        }, callback);
      }
docs: Retrieve a message in a conversation
  
  @param  {String}   messageId       Message ID
  @param  {String}   conversationId  Conversation ID
  @param  {Function} callback        Callback function