How to say “Our barber has another customer waiting, so please check the next appointment.” in Japanese

In Japanese

担当(たんとう)の理容師(りようし)、次(つぎ)のお客(きゃく)さんがもう待(ま)ってるから、次(つぎ)の予約時間(よやくじかん)を確認(かくにん)してくれる？

Tantō no riyōshi, tsugi no okyakusan ga mō matteru kara, tsugi no yoyaku jikan o kakunin shite kureru?