Alexa course, get user input


in ‘speak, listen & reprompt’ part of the course, when I wanted to test my skill, it only play the speak part and the reprompt speech is never played out. I used the course code based on the instruction:

"use strict";

var Alexa = require("alexa-sdk");

var handlers = {
  'LaunchRequest': function() {
    this.response.speak("Hello, Welcome to Codecademy. What do you think is Codecademy's most popular language?").listen("Tell me what you think is Codecademy's most popular language.");

  'LanguageIntent': function () {
    this.response.speak("Python is our most popular language.");

exports.handler = function(event, context, callback){
    var alexa = Alexa.handler(event, context);