Hello, my name is XXX, I am with YYY company, sorry to interrupt you, may I ask for your (product/services) who are you currently use? A, B or C?
oh? C? that's great! now, I don't want to waste your time, so i'll just ask you a few direct questions that matters to you to find out if there is any (saving/value/benefits) for you. If not I'll be out of here, sound fair?
then start probing..