"YAY!" Was the response, looking utterly confused at the seatbelt and honestly thankful that Lilo was there to sort it out for him, giving it a tug once it was buckled, "Ohhhh, okay. Seatbelt." A nod then, having committed that piece of information to memory.
He poked Lilo's arm then, "Found you." Because clearly he'd been looking for her, otherwise he wouldn't have found her.