This is in reference to the interview you had with us on (day and date)
We thank you for showing an interest in our organization and sparing the efforts and time to call on us for the interview.
Owing to a mismatch of our requirements and your performance in the test, we cannot employ you at present. However, we have kept your profile and, if an opportunity suitable to your profile arises in future, shall consider you again for sure.
We wish you all the best in your future endeavors.