Create Dynamic Range With Updating Chart

I have created a spreadsheet which uses data validation to allow a user to select a company, start Date, end date, and projected months in order to output different figures. I have attached a spreadsheet to this post in case that was hard to understand.

Since there is data validation, indexing, and matching going on, as different selections are made, various tables change as a result. Uou will be able to see what I mean as you open the example sheet and start messing around with the data validation boxes.

The problem I am encountering now, is creating an exponential graph that will also keep changing as the user changes their selections in the data validation boxes. I am unsure if this is even possible, but I figured it was worth a shot to ask. On the example sheet, I have included a graph similar to the one I want, but it only contains data in a certain range of cells, rather than dynamically changing to accommodate whatever data is outputted.

Here is what I am looking for in the graph:
1. Whatever dates are selected by the user in the data validation boxes, along with the projected dates will be on the x-axis.
2. The PMPM figures associated with the selected dates, and the projected dates on the y-axis.
3. Ability to make different selections from the data validation boxes and still have a dynamic chart that keeps updating itself.