I respond with a "maybe" when I want to attend but don't know if it's possible yet. If "maybe" isn't an allowed response, I guess I'd have to answer "no" to be

I respond with a "maybe" when I want to attend but don't know if it's possible yet. If "maybe" isn't an allowed response, I guess I'd have to answer "no" to be safe, even though I really do want to attend. That seems suboptimal to me.