This is Suzuki. I'm calling from room 201.
I wanted to use the gym facilities, but unfortunately, it appears that the gym is currently closed.
Could  you please provide me with information about when the gym will be open again? Additionally if it won't be available for some time or there's another Fitness facilities nearby that guests can use instead?

※ 目下閉鎖中のホテルのジムがいつ再開されるのか？しばらくは開く予定はないのか？だとしたらそこを使えない代わりに客が使えるフィットネス施設は近くにないのか？  を尋ねる場合は未来形 will,  won't を使う