It looks like you're a little late.
4 seconds sound clip from the Casablanca (1942) movie soundboard.
You can hear this line at 01:02:15 in the Blu-ray version of the movie.
Quote context
[...]
- But I told my men to be especially destructive.
- You know how that impresses Germans.
- Rick, have you got those letters of transit?
- Louis, are you Pro-Vichy or Free French?
- Serves me right for asking a direct question. The subject is closed.
- It looks like you're a little late.
- So Yvonne's gone over to the enemy.
- Who knows? In her own way, she may constitute an entire second front.
- I think it's time for me to flatter major Strasser a little. I'll see you later.
- Sascha!
- Put up a whole row of them. Starting here and ending here.
[...]