There aren't a whole lot of meaningful things that a civilian like myself can say. I'm exceedingly lucky to have grown up in a country that hasn't known war in my lifetime. That 'luck', unfortunately, did not come without a cost and a great number of valiant Canadians sacrificed their lives so that I and my children might grow up with the blessing of a peaceful homeland.
There aren't a whole lot of things that I can say that won't sound horribly trite.
So, instead I'll say:
I promise to honour your sacrifice by continuing to work at being an informed and active citizen - to help maintain and uphold the Democracy you have fought and died to protect.