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don't get me wrong, but ...; I'm sorry
ご期待に沿えず申し訳ありませんが、あしからず。
I apologize for not meeting your expectations; please don't take it personally.
あしからず、在庫切れのため本日の販売は終了です。
We are sorry, but sales have ended today due to being out of stock.
急な変更で申し訳ありませんが、あしからずご了承ください。
I apologize for the sudden change; please understand.