I will go out on a limb and say that is wrong, regardless of your culture. It's one thing to lie to cover up a schedule mistake; that can and does happen everywhere on the planet. But leading someone else to waste further time waiting for you is extremely inconsiderate and I can't believe anyone would consider that right behavior under any circumstances. --- Having said that, I suppose I will be on the lookout for it. If someone says they are on their way but in heavy traffic, perhaps I should ask them whether another day might be more convenient. That probably is the face-saving way to think about it.