Request For Nomenclature Option

We are a 55+ community with 3 pickleball courts. We currently have approximately 80 to 100 residents playing pickleball with an anticipated number of participants of near 150 when the community is completely built out. We are not a for profit organization. We do not charge for court usage. In effect, all the residents own the courts. The reason why we are building a website. is to give our courts organization. One of the elements is to have the option of reserving a court but only to avoid confusion or conflict for players who just drop by to play. We want them to look at the Book A Court page and see if they go to the courts there is a pretty good chance there is availability or at least rotate in or out with those playing. If the only description in each time slot is the work "Reserve" it doesn't give an accurate message. This sounds petty BUT some people in the community are not in favor of a "Reserve" system and only using the word "reserve" doesn't deliver an accurate message. We would prefer ot to say Open/Reserve. Doesn't seem like a big request but I'm about as far from a programmer as one could get. 

Btw, if I were a for profit business and I was selling court time, I wouldn't have this issue.