I really can't say, though, I saw him quite often in Paris.
5 seconds sound clip from the Casablanca (1942) movie soundboard.
You can hear this line at 00:35:44 in the Blu-ray version of the movie.
Quote context
[...]
- I will.
- There's still nobody in the world who can play As Time Goes By like Sam.
- He hasn't played it in a long time.
- Night.
- A very puzzling fellow, this Rick. What sort is he?
- I really can't say, though, I saw him quite often in Paris.
- Tomorrow at 10, at the prefect office.
- Boss?
[...]