We never had any problems with that! You may just have to wait a little bit longer for them to squeeze you back in. They know that at times it can be difficult to count on bussing, crowds, children, etc. I'm sure many have had bad experiences, but I've only had good dining experiences. The only place that I heard as being a stickler for the times was Le Cellier, but that was back when it was 1 dining credit for dinner.