“Hi [NAME], it’s [YOUR NAME] you know when I rang the other day and you promised I could do the free review for you?
Well I’m up & running now, and I wondered how soon we could do that.
I fully appreciate that it may or may not be for you, but you’ll know some people it will help, and I could definitely do with the practise.
I’m free on [This day] or [that day], which suits you best?/ Are mornings, evenings or afternoons better for you?
Great – see you on [DATE/TIME]. We’ll catch up then I’ll have to dash, because I’ve the others to call.