Person 1: Hi! Why are you sad?
Person 2: When i was walking through my garden i saw my gardener wasting water. I scolded him and corrected me. But however other people whom i dont is also still doing the same mistake what my gardener has done.
Person 1: Dont worry. You join in water saving campaigns. Go to various places, wherever you are able to go correct the people wasting water. Help them understand about the importance of water. 
Person 1&2: Save water