code: function(userId, conversationId, callback) {
        if (!userId) return callback(new Error(utils.i18n.conversations.userId));
        conversationId = utils.toUUID(conversationId);
        if (!conversationId) return callback(new Error(utils.i18n.conversations.id));
        utils.debug('Conversation getFromUser: ' + userId + ', ' + conversationId);
  
        request.get({
          path: '/users/' + querystring.escape(userId) + '/conversations/' + conversationId
        }, callback);
      }
docs: Retrieve a conversation from user
  
  @param  {String}   userId          User ID
  @param  {String}   conversationId  Conversation ID
  @param  {Function} callback        Callback function