No, it's okay, you don't have to apologize.

[She's not the kind of person who would begrudge him for not being the person she wanted to see. If anything, she just laughs quietly, pressing her fingertips more firmly into her chest as she dips her head back to him from her seated spot at the bench.]

Sorry for the confusion... um, I'm Kaede Akamatsu. Are... you new here, Arisato-kun?

[She's absolutely certain she'd remember seeing him around if he weren't.]