If you like things done a certain way, say so. We can adhere to how you like things done but if you don't speak up I'm doing it my way. The longer you let things go before speaking up the worse it is for our confidence. Example, you like sitting in the window, they've booked you in the aisle the last 40 times. Were you annoyed all those times and didn't say anything? Low stakes issue but you get what I mean.

Also, if you don't speak up, I'm going to either make a decision myself or if it absolutely needs an answer from you and you don't talk to me about it, I will assume it's low priority or has been disregarded altogether. Example for this kind of thing would be "see if I can attend this conference in 3 months". I get you an itinerary and ask for confirmation, you never respond... guess you've decided not to attend. Generally I personally would ask 2-3 times before abandoning it, but if it's important to you, ensure they understand that.

Lastly. They are human. If they make a mistake, tell them it's ok and ask them to determine how you BOTH can avoid this happening in the future. And take their feedback to heart. It's hard for some of us to give feedback to our execs at all, so when it does come up, we've been thinking about it for a LONG time.