You can reply by sharing a heartfelt, sincere, and genuine answer. For example, you could say, "Ever since I was young, I've always dreamt of going on a romantic hot air balloon ride during a beautiful sunset. I haven't had the chance yet, but I imagine it to be a magical experience, especially when shared with someone I love." This answer not only shows your vulnerability by sharing something you've always wanted to do but also communicates your interest in sharing a special moment with your loved one.