function* genDialog() {

  // line 1

  let question1 = yield "What's your name ?";

  // line 2

  console.log('response 1 : ', question1); 

  // "response 1 : ", "My name is Héla !"

  // line 3

  let question2 = yield "Where do you live ?"

  // line 4

  console.log('response 2 : ', question2); 

  // "response 2 : ", "I live in France."

}

// line 5

let generatorDialog = genDialog();

// line 6

console.log(`question 1: ${generatorDialog.next('Hi !').value}`);

// "question 1: What's your name ?"

// line 7

console.log(`question 2: ${generatorDialog.next('My name is Héla !').value}`);

// "question 2: Where do you live ?"

// line 8

console.log(generatorDialog.next("I live in France."));

// {done: true, value: undefined}