Coach's Challenge: EDM @ CGY - 3:57 of Second Period

At 3:57 of the second period in the Oilers/Flames game, Calgary requested a Coach's Challenge to review whether Pat Maroon interfered with Calgary goaltender Brian Elliott before the puck entered the net.
After reviewing all available replays and consulting with NHL Hockey Operations staff, the Referee confirmed no goaltender interference infractions occurred before the puck crossed the goal line.

Therefore the original call stands - good goal Edmonton Oilers.
Since the Coach's Challenge did not result in the original call being overturned, the Calgary Flames forfeit their time-out.