残念だ

What a pity!

pity   /'pɪti/　noun

★ used to show that you are disappointed about something

★ a sad feeling caused by the pain and troubles of others

Such a pity

So sorry but my wife Sela has to go into a town today for an urgent matter. Such a pity since she was looking forward to meeting you all.

but ; 謝罪の言葉の後に理由を説明する時に使用する「でも../しかし..」