"有"means "have", when people ask you"你有书吗", then you can answer"我有" or "我没有" “对”means "yes"

有 = have 对 = correct / towards

See I also thought something similar, I will try and and provide context, The problem is its audio. I'll see what I can do to provide a contextual question. Kinda had my fingers crossed that it wouldn't make a difference but it was hope rather than expectation.

What 'you' and 'dui'?

Is it "又"and“对”？