Tracking daily cashflow spreadsheet template

I run an accounting firm - I need a spreadsheet template done so that I can send it to clients and they can use it to track their businesses cashflow. It is designed for clients who's cash is tight and they need to be really on top of their cashflow.
I want the ability for them to enter in their, say, overdraft limit, and it would flag if they were going to breach it.
I want the spreadsheet to model out for a 90 day period