【社外(しゃがい):お客様(きゃくさま)の希望(きぼう)に沿(そ)えない時(とき)】 「誠(まこと)に恐(おそ)れ入(い)りますが、ご指定(してい)の商品(しょうひん)は「あいにく」品切(しなぎ)れとなっております。」
The missing word is 「あいにく」. This means "unfortunately" or "regrettably." It's used to express regret when you cannot meet a request or when something undesirable has happened, often preceding a polite refusal or explanation in business communication. It softens the bad news.
「あいにく」は「残念ながら」の意味。相手の期待に応えられない時に使う、丁寧な言葉です。
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