Without context it's hard to comment on story. Style, however, could use some pointers, I guess
The phrase "Show, not Tell" is crucial in screenplays and visual media. It seems like this is a long string of dialogue with nothing to break it up. Even though I'm sure the actors would be performing some physical business when the cameras roll, it might be good advice to include some here, rather than a page of sheer dialogue.
Avoid (Pause) to denote a pause. Use "Beat." For instance, change it to
JOHN
Okay. Okay.
A beat.
JOHN (CONT'D)
Follow the money.
Next, the line "Alex is lost in his own confusion" is telling, not showing. Try something like "Alex blinks and furls his lip. He frowns. John continues."
Next, the "He is just improvising now" is kind of confusing. Is the actor improvising? The character? If the former is the case, that's not for the screenwriter to decide (even if you go on to direct). If the latter, it's another case of telling, not showing. Describe and show us that he's making it up as he goes.
Just some finer points of screenwriting, I guess. At the end of the day, it's 50% story, and 50% style if you want a script to be read or picked up or understood. If it's a passion project you and some friends will be shooting, then fuck all - get it down and don't worry about it.
If you involve anyone else, or want it read, or produced, or whatever, you gotta tighten up some things.
Keep going though. You're already doing better than most scripts I've read.