The line's busy. There's nobody there.
7 seconds sound clip from the Casino (1995) movie soundboard.
You can hear this line at 02:19:29 in the Blu-ray version of the movie.
Quote context
[...]
- What'd you have? I had a salad.
- You know why I wanna do it. Just do it. Fine.
- I just need to get the bowl for my thing.
- The line's busy. There's nobody there.
- Hello. Hello, Jennifer. It's Sam.
- All right. I didn't have lunch with Jennifer. Okay.
- I was with somebody. I know you were with somebody. Who was it?
- I just hope it's not someone who I think it might be. I just hope it's not that.
[...]