Not be able to arrange a date, alas?

• "Ah, woe!"

Wiktionary Word definitions in Wiktionary
interj. (context dated English) (non-gloss definition: An expression of regret or grief.)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Lackaday \Lack"a*day`\, interj. [Abbreviated from alackaday.] Alack the day; alas; -- an expression of sorrow, regret, dissatisfaction, or surprise.