most stores, the sales guy has no idea how easy or hard it is to get things... but after the time spent, they just want to say what will make a deal... get it to paper and worry about the details later.
just sold a cherokee... literally one out there as she wanted... i told her so. said keep your fingers crossed, but don't assume i can get it... you might have to settle for "dark white" paint, or as i like to call it, black.
problem is that i might say i can't guarantee it, so the customer isn't sure and walks... stop on the way home at the other dealer and the guy says, "it won't be a problem!"... where will you sign a deal? and once signed, you just want to stay there... usually you'll put up with a bit of runaround, and most often they have a bit of your chase deposit as leverage...
it's a fine line to walk being 100% honest and just being (naively) hopeful.