Sora, still reeling the fact he got woken up and that Kairi is here, is very confused at this scolding. "Huh? What? Waited for you at what cave? What are you talking about, Kairi? Did you just get here?"

Or did he accidentally stand her up for an unknown amount of time at a cave.....really in his tired mind, he's not sure which one is more plausible.