Google Now keeps track of a lot of things for you, but sometimes it's more useful to be able to ask your phone a direct question and get an answer back, especially when it comes to things like car rentals. Thanks to the latest update from Google, you'll now be able to use Google voice search about any car reservations you have, and it'll pull information directly from your Gmail account and display it for you. If you already have a reservation, the app will pull up all the details for you, including pick up and drop off times. And if you haven't made a reservation, well, it won't return anything and you know what the next item on your to-do list should be.
source: Google+
Also hotels.