I wish I could get GLaDOS's voice as a replacement for Siri's, and she'd just be a total bitch about everything. So even if she couldn't figure out what I wanted or whatever, she would just come back with something like, "I could tell you that, but I really don't feel like telling you, I would rather you suffered for the rest of the day, not knowing the answer." Just make her non-answers something I actually wanted to hear her say.