Historical clue formulations

• Feels remorse over — 2023-05-30
• "Sorry!" — 2005-10-28
• Terse R.S.V.P. — 2004-12-24
• Invitation turndown — 2001-06-13
• Brief turndown to an invitation — 1999-01-11
• "Sorry, I can't come" — 1994-08-21