A solution

gistfile1.txt

function findMyCampsites (campgrounds, viewToMatch, partySizeToMatch){
  let dreamSite =[];
  let sorryMessage = "Sorry, no campsites with that view are available to host your party";
  for (let i = 0; i< campgrounds.length; i++){
    if (campgrounds[i].isReserved === false && 
        campgrounds[i].view === viewToMatch &&
        campgrounds[i].partySize >= partySizeToMatch){
        dreamSite.push(campgrounds[i].number);
     } 
  } 
  if (dreamSite.length == 0) {
    return sorryMessage;
  }
  return dreamSite;
}