Asynchronous callback not firing this.emit(':ask') before exit of HandleLambdaEvent() about alexa-skills-kit-sdk-for-nodejs HOT 7 CLOSED

var request = require('request);
function myHandler(input, callback) {
         request('http://rest_url...', (error, response, body) => {
               if (response) { // we have a success so call the call back
                     callback(null, 'found it!');
               } else {
                     callback(error);
               }
        }
}

	var filledSlots = delegateSlotCollection.call(this);

	//compose speechOutput that simply reads all the collected slot values
  var speechOutput = randomPhrase(showIntro);


  var showCity=this.event.request.intent.slots.showCity.value;
  var timePeriod=this.event.request.intent.slots.timePeriod.value + 'T10:00:00Z';

 
  const self = this;  // <--- pointer to this in the outer function scope
  request("https://app.ticketmaster.com/discovery/v2/events.json?city=Boston&size=1&segmentName=Music&apikey=bP5gQH4GDftg8tE8j3dyXHYYPdNzDBV7", function(error, response, body) {
           if (response) { 
                self.emit(":tell",Object.keys(response).join(' '));
           } else {
                 self.emit(':ask', 'hello');
           }
    })

'use strict';

var Alexa = require('alexa-sdk');
var http = require('http');
var axios = require('axios');

var calendar = require('./helpers/googleCalendar.js');
var self = this;

// Register handlers and initialize start
exports.handler = function(event, context, callback) {
  var alexa = Alexa.handler(event, context);
  alexa.appId = APP_ID;
  alexa.registerHandlers(newSessionHandlers, startSearchHandlers);
  console.log('before exec');
  alexa.execute();
  console.log('after exec');
};

// Reference to Alexa object

// States
const states = {
  SEARCHMODE: '_SEARCHMODE'
};
// Messages and other reoccuring data
const APP_ID = 'amzn1.ask.skill.e0cd726d-f53c-4769-967c-8cacd8862a80';
const helpMessage =
  'For example, you can ask: What are my appointments for today?';
const HELP_REPROMPT = 'What can I help you with?';
const STOP_MESSAGE = 'Goodbye!';
const SKILL_NAME = 'Miracle';
const welcomeMessage = 'You can ask for your todays appointments';
const shutdownMessage = 'Ok. See you soon.';
const errorMessage = 'Ups... Something went wrong. Please start me again.';

// Adding session handlers
const newSessionHandlers = {
  NewSession: function() {
    this.handler.state = states.SEARCHMODE;
    console.log('I am in the launch');
    this.response
      .speak(`Welcome to ${SKILL_NAME}` + ' ' + ' ' + welcomeMessage)
      .listen(welcomeMessage);
    this.emit(':responseReady');
  },
  Unhandled: function() {
    this.response.speak(helpMessage).listen(helpMessage);
    this.emit(':responseReady');
  }
};

// Creating hanlders for state SEARCH state
const startSearchHandlers = Alexa.CreateStateHandler(states.SEARCHMODE, {
  // Built-in intents
  'AMAZON.YesIntent': function() {
    output = welcomeMessage;
    this.response.speak(output).listen(welcomeMessage);
    this.emit(':responseReady');
  },
  'AMAZON.NoIntent': function() {
    this.response.speak(shutdownMessage);
    this.emit(':responseReady');
  },

  // 'AMAZON.RepeatIntent': function() {
  //   this.response.speak(output).listen(HelpMessage);
  // },
  SessionEndedRequest: function() {
    this.emit('AMAZON.StopIntent');
  },

  searchIntent: function() {
    const url = 'http://127.0.0.1:5000/customers';

    axios.get(url).then(
      response => {
        console.log('Success!', response); // Yea, REST all the things
        self.emit(':tell', 'ok');
      },
      error => {
        console.error('Failure!', response); // Boo, bad feels
        self.emit(
          ':tell',
          "Hmm.. that didn't work.  Check the CloudWatch Luke."
        );
      }
    );
  }
});