Synthesize a dialog via Chrome's built-in speech synthesis.

dialog.js

// Synthesize a dialog via Chrome's built-in speech synthesis.
// Hardcoded to British Male / US Female, slightly slowed down,
// with random pauses between lines.

// Copy&paste this into Chrome's Console.
// You might have to copy the first 2 lines individually / with delay / twice;
// getVoices() takes a while? (Chrome 57)

var msg = new SpeechSynthesisUtterance();
var voices = speechSynthesis.getVoices();

// check here if voices is populated and not []
// if so, repeat last line & check again

console.log(voices);
if (! voices[0]) console.error('no voice');
var v = [
	voices[1],
	voices[3]
];
console.log(v);

var s = [
'Hello, What\'s Up!',
'Nice to meet you.',
'I will ask you questions. Are you ready?',
'I was born ready.'
];

var i = 0;

msg.onend = function (e) {
	if (i < s.length) {
		window.setTimeout(function () {
			next();
		}, Math.random() * 3000);
	}
}

function next () {
	var vno = i % 2;
	msg.voice = v[vno];
	//msg.voiceURI = 'native';
	msg.text = s[i];
	msg.rate = (vno === 0) ? .7 : .85;
	console.log(v, vno, msg.voice, msg.rate, msg.text);
	speechSynthesis.speak(msg);
	i++;
}

next();