Ah, forget it. You did your best, Morgana.
4 seconds sound clip from Darkwing Duck - Dead Duck (S1E47).
You can hear this line at 00:13:32.054 in the DVD version of the TV Series.
Quote context
[...]
- I think I may have found an incantation which will work.
- Ah, forget it. You did your best, Morgana.
- I guess this was just meant to be.
- Gee, DW seems real depressed, even for a dead guy.
- You better head home, Gosalyn. I... I'll go check on him.
- I'm not gonna sit around and let Megavolt get away with murder.
[...]