In this country at least, "Can I help who's next?" has become a common phrase. It assaults my ears every time I hear it, like nails on a chalkboard. In the long form it would be, "Can I help who is next?" It's really two questions strung together, "Can I help?", "Who's next?" There are so many other ways to phrase it that would be fine. The two I just mentioned, "Can I help the next person in line?" or, how about that personal touch, "Can I help you?" (look directly at the person you are speaking to). Could customer service go that far? To actually make eye contact?
Another favorite of mine, is when I walk up to a cashier, and without looking up, they blurt out, "Can I help you sir?" Yes, I am a carpenter, I wear work boots, carpenter pants, and sweatshirt, or some other masculine drably colored garb. I'm not particularly curvy, and I have short hair, but I don't smell bad or flash any butt crack. (sorry guys, for that sweeping generalization)
I'm always a bit put off by this however because I feel that the "sir" is thrown in as a measure of respect, yet this person has not even focused on me, and correctly determined my gender. Once they look at me, they get all embarrassed and red, and apologize, and I have to wonder, how often does this happen to this cashier or salesperson? Because it happens to me a lot. I find the best way to respond to this, is simply smile, while burning a hole through their forehead using my evil-eye-heat-vision. Yes, I could dress in pink, and grow my hair, and put a scrunchy in it, but I'd rather be looked at by the people addressing me. Is that too much to ask?