Creating a voice reminder inside Android's Google Now search has just gotten easier with less screen taps required. Google has quietly flipped the switch on its servers so that no updates are required that would allow users to create a reminder from start to finish by only using their voice and not having to tap on the screen for confirmation.
Now, when you need to set a reminder, all you would need to do is say "yes" into the microphone to confirm what Google had just transcribed from your voice. This ensures that Google was able to create the reminder accurately using the speech-to-text engine, a process that previously required users to hit an "OK" confirmation on the screen.
If Google didn't get something right, or if you change your mind after you initiated Google Now, you can say "no" to cancel the reminder.
Source: Android Police