Nick is applying for a job to work for Jessica. Jessica calls up Nick's former employers, Brad, to inquire about Nick. Brad tells Jessica, "I have to be honest with you. I noticed cash missing in the register whenever I left Nick alone in the store. I can't prove anything, but I have to wonder about his honesty." Nick later sues Brad for defamation. Assuming that Jessica has no knowledge that Nick stole anything, can Nick prevail? Explain.