function endSentenceWithYo(template, ...expressions) {
	return template.reduce((accumulator, part, i) => {
  	return accumulator + expressions[i - 1] + part
  }) + ", yo!"
}

let type = 'delivery guy';
let name = 'Barry';
let says = 'Here ye go';

var template = endSentenceWithYo`The ${type} ${name} says: ${says}`;

console.log(template);