The phrase "a reason for you" is correct and usable in written English.
It can be used when explaining or justifying something specifically for someone else.
Example: "I have a reason for you to consider this opportunity; it could greatly benefit your career."
Alternatives: "a justification for you" or "an explanation for you".
The easy way to keep you from believing what Alex Jones does is for you to be a critical thinker and to realize that most of what he says is ludicrous and if he says something that is remotely reasonable, that's not a reason for you to believe other things he's said," Jackson said before breaking into a deep sigh.
"If you were born there was a reason for you to be here".
"We can say to the artists, 'there's now a reason for you to stay," she said.
If ever there was a reason for you to splurge on a kitchen scale, this is it: there is real precision here, and if you follow the instructions to the gram, you will produce very good bread.
Unlike just about every major national holiday — Memorial Day, Veterans Day, Labor Day, Lincoln's Birthday or the Washington's Birthday remembrance popularly known as Presidents' Day — King Day is not invoked as a reason for you to run out to buy a new toaster or an iPad.
"If you sign a treaty that calls for international arbitration around maritime issues, the fact that you're bigger than the Philippines or Vietnam or other countries... is not a reason for you to go around and flex your muscles," Obama added, according to Reuters.
Perhaps she has a reason for telling you...but if you just walk away, you will never find out.
If you do ask, you better have a reason for why you need it!
The advantage of being a "reasonable creature," Franklin remarks, is that you can find a reason for whatever you want to do).
Zoosk asks you for a reason for why you're deactivating.
A brisk pace means you have a reason for movement, you're dedicated and motivated to get something done.
