Yes they are, and a vote to every answer here, one is not enough and everyone is so correct.
Unfortunately the concept is sadly missing so much in recent generations.
Next time you are at Coles or Shell etc, when they ask for the money, and as usual when they do not say 'please', reply instantly to them 'PLEASE' as a question. Half the time they will ignore the hint, either not understanding the hint, or stand firm denying the correction, and the other half you will get an argument. Customer service is so lacking these days, all because of a lack of manners.
Oh, excuse me please, I sincerly apologise for any mistake I may have just made. Thank you so much.