Automatic email confirmation for Google Forms

confirmation.gs

function confirmation(e){
  const TIME = 0;
  const NAME = 1;
  const EMAIL = 2;
  var userName = e.values[NAME];
  var userEmail = e.values[EMAIL];
  var subject = "Form Submitted";
  var message = "Thank you," + userName + "for registering!";
  
  MailApp.sendEmail (userEmail, subject, message);
}