Think about what is the most important aspect of what you requested. Did you request a certain area so you wouldn't have to look at construction? Did you request it to be close to something (pool, food, etc.)? If I have a specific request that I really hope can be met (like a first floor room when I travel with Mom - no elevators for her!), I just casually mention that "I hope they were able to meet the request for (insert request here) because it will really help with (insert reason here)". I've had pretty good luck using that approach. Of course, I always have the request on the reservation, but they don't always know why you're requesting it. That makes it easier for them to find a room that will fulfill your needs best. It also helps if you are arriving early in the day, so there is a larger pool of available rooms to choose from. If there are only 20 rooms available for check in that day with your request, and 30 families have requested the same thing, the first 20 families checking in will get it.
The only time I haven't had my request met was when CR was under construction for their last big renovation in the 1990's. I had requested North Wing, because I knew the South Wing was smoking (at that time) and the day I checked in, they took the whole North Wing down for renovation. Sometimes when it's construction related, they don't have as much leeway as they might normally have. I still had a good time anyway (once I got the room aired out - so glad I don't have to worry about that anymore).