How to assign amount in dollars to different users in wordpress

We are using Woocommerce based website in Wordpress platform and looking for some function or plugin in which we can assign different amount (in dollars) from dashboard to different users.

For example if there are 3 users with different roles then we are capable of assigning different amounts (in dollars) to all of them so that they can purchase items from their accounts within that amount.

In more detail lets say 3 users are Jack, Steve & Smith. So I want to assign Jack = $200, Steve = $400 & Smith = $500.

And they will be able to purchase products from this website within this amount and after they are done with this specified amount they can use their credit/debit cards for further purchase.

Please help. Thanks in advance!

via Chebli Mohamed