Ok, here's a bit of a stretch. What song is this?
 

I heard it on the radio a few times. It's a female singer, a little whispy sounding. Very mellow. The only line I remember is:

"Don't know why I didn't come."

She does say it over and over, though. Any ideas? I think it's a newer song.

Norah Jones "Don't Know Why"?

That would be it, thanks!