All award bookings, including partner flights, can be cancelled and refunded for free correct? Is there a minimum time limit like min 1 week out?

Is there a way to get the 30 day calendar to only show dates that match my search criteria? I'm searching for non stop business seats and the 30 day calendar shows availability on all days but when I click on a date, sometimes it says "No flights match the filters you've selected." Thank you.