{
    "state":{
       "controllerStates":[
       ],
       "rulesetStates":[
          {
             "rulesetContext":{
                "dialog_stack":[
                   {
                      "dialog_node":"root"
                   }
                ],
                "dialog_turn_counter":1,
                "dialog_request_counter":1,
                "_node_output_map":{
                   "node_1_1504607088493":[
                      0
                   ]
                },
                "branch_exited":true,
                "branch_exited_reason":"completed"
             },
             "convId":"XXXX",
             "modelRef":"XXXX"
          }
       ],
       "selfCallCount":0,
       "sysTurnCount":2,
       "userTurnCount":2
    },
    "context":{
       "conversationContext":{
          "brand":"XXXX",
          "channel":"XXX"
       },
       "userData":{
          "tokens":[
          ]
       }
    },
    "XXXXX":"2.0",
    "XXXXX":"XXXXX",
    "XXXXX":"XXXXX",
    "XXXXX":"XXXXX",
    "XXXXX":"XXXXX",
    "turnStart":"2018-08-10T15:21:36.075Z",
    "turnEnd":"2018-08-10T15:21:36.076Z"
 }

const update = require('immutability-helper');

    function updatePropertyValue() {
    const momentDateChange = getRunDateAsString();
    update(aggRequest, {
          $set:
            {
            turnEnd: `${momentDateChange}`,
            },
      });
     console.log(aggRequest)
}