Hi as i recalls , Mad hatter did say a memorable quote to Alice when they are standing in the balcony at the White Queen's castle

Well, since I'm not sure which quote you're looking for, I'll just transcribe the whole scene for you.

Hatter: Have you any idea why a Raven is like a writing desk?
Alice: Let me think about it.
Hatter: You know what tomorrow is, don't you?
Alice:...Frabjous day, how could I forget. I wish I'd wake up.
Hatter: Still believe this is a dream, do you?
Alice: Of course. This has all come from my own mind.
Hatter: ...which would mean that I'm not...real.
Alice: Afraid so. You're just a figment of my imagination. I would dream up someone who's half mad.
Hatter: Yes, yes...uh, but you would have to be half mad to dream me up!
Alice: I must be then......I'll miss you when I wake up.

I'm going to assume you mean "I'll miss you whe I wake up."

Is that the quote you're looking for?

Why is a raven like a Writing desk