One thing you will notice as soon as you arrive in small town Czech Republic is the fact that everyone says hello to you when you meet them. You are walking down the road and meet someone coming in the opposite direction - “Dobry den” you both say with a nod and a smile, even though you have never met before. As you walk into a shop the shop assistant will greet you and you should reply in kind. As you leave she will say “Na shledanou” and again you reply in kind.
This is not just a custom for the older members of the population. It always surprises me when I pass a group of hooded youths, to hear the largest of them greet me with a Dobry Den. This includes our local gypsies, who, whilst having bought into the fashion and air of the Bronx wholesale, have not bought into the “You looking at me?” demeanour, no - “Dobry den” they go.