Looking for a plugin that…

Hello,

I spend already a few ours looking for a plugin which can do the following job.

Lookup 2 values in a db table and when there is a match redirect to page A and when there isn’t a match redirect to page B.

Example:
form field 1: postal code “where I am”
form field 2: postal code “where I want to go”
When the user is entering both and clicking on “ok” button, there have to be a check in the database if both values exists.
If both postal codes are matching -> redirect to a page A
If non of both postal codes or only one is matching -> redirect to page B

I hope that my description was clear enough.
So does someone already have seen a plugin for this need?

Thank you in advance
Tonie