[{"key":1,reserved:["12-02-2021","12-03-2021"]},{"key":2,reserved:["12-01-2021","12-05-2021"]},{"key":3,reserved:["12-01-2021","12-04-2021"]}]

db.collection.find({reserved:{$nin:["12-02-2021","12-04-2021"]}})