Back in my corporate days, one of my duties was to educate sales people on the use of semantics. Instead of saying "We would have to special order that..." saying "We don't currently have one of those, but I'd be happy to get one for you..." turns a negative into a positive. Likewise "Nope, we don't carry that." could be replaced by "We don't currently offer that particular item; Is there an alternative you might be interested in?", or "We don't carry that particular brand, but we have XXXX available, let me check if they have something similar..."

The same information is communicated, but the tone is very different afterwards. A smart man learns from his mistakes, a wise man learns from the mistakes of others...