Sora didn't know why Riku was thanking him, but okay.
No, he didn't want to go anywhere or do anything else. The fact that he HAD to come to the dining hall was bad enough. So he shook his head, paused, and nodded.
Sora tried his best to eat the rest of his food, but eventually he just pushed his tray away, signaling that he was done and ready to go.