You can use the following: “Let [person name] know/I said”… (1/2/3) “Tell [person name]”… (1/2/3) 1. Break a leg. (old skool/older adults) 2. I wish her/him the best. 3. Good luck. He/She got this/it! (To make it seem more natural)

As a native english speaker: I wished him good luck!

'Tell him I say good luck' or 'tell him I wish him good luck.'

Wish him luck for me Tell him I wish him luck Tell him I say "good luck"