You sold us a dream. Does it make sense for you ?

I think that you have not mentioned the term "hier soir", i.e., last night (yesterday evening), haha. :) In terms of translation, yes, it means something like "You (informal) sold a/some dream to us last night". I however expect that you were watching some scientific fictional movies or reading some kind of novels, in which there came up such a dialog. --- Good day. / Bonne journée.