Facing session issue with alexa sdk v1

I'm trying to build conversational Alexa skills using Alexa SDK v1 and dialog intent in node js but I'm facing an issue of the session.

Currently, I'm trying "this.emit(:responsebody)" with "response.shouldsessionattribute" and "response.listen" but still session times out. As I read that "this.emit(':tell') " end the session that's why I replaced this with "this.emit(:responsebody)".Here is code with cloudwatch log error snapshot

const alexaSDK = require('alexa-sdk');
const nforce = require('nforce');
const org = nforce.createConnection({
   clientId: "NA",
  clientSecret: "NA",
  redirectUri: "NA"
  });  
const handlers = {
  'LaunchRequest'() {
    this.emit(':ask', instructions);
  },
  'Unhandled'() {
    console.error('problem', this.event);
    this.emit(':ask', 'An unhandled problem occurred!');
  },

//this intent working fine
'LoginStartIntent'() {
 const { accessToken } = this.event.session.user;
if(!accessToken ) { 
  this.emit(':tellWithLinkAccountCard', '');        
      }
      else
      {
//logic for integration
      }
var speechOutput = "";
// this.emit(':tell', speechOutput); (this set the shouldsessionattribute to true)
//this.response.shouldEndSession = false;
this.response.speak(speechOutput);   ( found this as a solution)
this.emit(":responseReady");
  },

//this is not working error:session is not defiend
'NewLeadsIntent'(){
   const { accessToken } = this.event.session.user;
   if(!accessToken || !instanceUrl ) { 
       this.emit(':tellWithLinkAccountCard', '');
      }
else
{
  const query = '';
  var speechOutput ;
console.log('working 1');
  // auth and run query
org.query({ query:query ,oauth: getOauthObject(accessToken)}, function(err, res){
  if(err)
  {
    console.log(err);
     speechOutput = 'Darn, there was a Salesforce problem, sorry';
} 
  else {
    // logic for sucess responsce
    }
  }
});
 //this.emit(':tell', speechOutput); (this set the shouldsessionattribute to true)
this.response.speak(speechOutput); 
//this.response.shouldEndSession = false; ( found this as a solution)
//this.response.listen(); ( found this as a solution)
this.emit(":responseReady");
}
},
 'AMAZON.HelpIntent'() {
    const speechOutput = '';
    this.emit(':ask', speechOutput, reprompt);
  },
  'AMAZON.CancelIntent'() {
    this.emit(':tell', 'Goodbye!');
  },
  'AMAZON.StopIntent'() {
    this.emit(':tell', 'Goodbye!');
  }
};
function getOauthObject(accessToken) {
  // Construct our OAuth token based on the access token we were provided from Alexa
  var oauth = {};
  oauth.access_token = accessToken;
  oauth.instance_url = instanceUrl;
  return oauth;
}
exports.handler = function handler(event, context) {
  const alexa = alexaSDK.handler(event, context);
  alexa.appId = appId;
  alexa.registerHandlers(handlers);
  alexa.execute();
};