Though I'm not a great fan of elaborate questions myself - I don't mind the "I want a reading about my job prospects" and such - I do like readings to be conversations. They are, of course, not totally balanced conversations, as I have the cards and read them, and my querents take their cue from that. But I find that querents are more engaged when they are able to take part in the conversation with the cards, via me. It's certainly what I always expected and asked for as a querent, so I can hardly offer a different service! That said, some people just sit in silence, and that's fine too.
As for lies - my (other) work taught me how to find them out and factor them in. As Balenciaga and Umbrae wrote, it's not up to us to expose our querent's lies to them. Simply, I find discerning untruths to be useful in my interpretation of the cards - one more thing that goes into the pot.
Of course, if you are faced with someone who just says - no, that's all wrong, when you have a strong inner feeling that at least part of it is true, you have a problem. Finish the reading and thank them, all the same. After all, it's their reading. If they want to lie or live in denial, it's their look-out. You give them the tools to look at the truth if they want - and that's it.