It will require either ripping out the walkway and redoing it, or excavating a drain under the walkway to funnel the water out. It's outside his job description.
I tried to get an estimate from him back in the spring & we set up an appointment for him to come over, the first time he called to reschedule the second time he just didn't show up. I don't do buisness with people who aren't dependable so I never called him back.