Google has boosted the voice command capabilities of Google Now to lessen all the screen tapping you have to do. You can now set and confirm reminders with just the use of your voice. You needed to tap on the screen to confirm a reminder before. But now you just need to answer “yes” to confirm your reminder. Google Now will repeat your reminder to you to confirm it got the right message. If you want to cancel the reminder, all you need to say is “no.”
Source: Android Police