The findings from your interviews will help you see whether the persona that you initially created is accurate, or needs to be tweaked.
Your insights will allow you to update, validate, and adapt your persona. The key to great products and services is to use what you've learned to make your product better.
That's how you delight your customers.
Don't worry if you were a bit off-base with your initial vision. You've learned a lot since then, and been able to hone in on your true customer. This will reduce the chance for mistakes later in the process, and help ensure that your product is truly great.
Look at your assumptions and ask yourself:
After answering these questions, revise your persona, based on what you know.