checking existing Contacts in form to send different LP

Summary:

How to check (in processing steps) if the Contact who submit the form was already in database? Base on that send him different LP (Redirection URL).

Content (please ensure you mask any confidential information):

Hello Community!

I have a challenge regarding the form and registration for new customers.

1. I would like to check every time if the person who registers to the form already exists in the database or not?
2. If it does, I would like to send them LP_01
3. And if it is a new Customer, I want to send them another LP_02.

I tried to use the processing step based on Date Created (operator after/before) in the conditions for the "Redirect to URL" step, but unfortunately it does not work.