Lawful Good: Using an LED candle rather than a real one, in keeping with health and safety regulations for unattended candles, and turning it off responsibly when not in use.
Or using a brass candle-snuffer that you bought at a charity shop.
Neutral Good: Blowing it out.
Chaotic Good: You finished your water, so just put the glass upside down over the candle.
True Neutral: Uuugh it's practically at the bottom anyway, just let it burn out.
Lawful Evil: Nagging staff or host until somebody comes over to extinguish it.
Neutral Evil: Dropping it into the water jug at the table.
Chaotic Evil: Spitting on it.