Phone you pretending that they haven't met you before. Ok so I understand if maybe the booking went bad, but if the booking went fine, why call couple months/weeks later and acting like we have never met?
Client-"Hello is this so and so? I saw your ad on so and so.
I'm here thinking, "man I've seen you before, your number is saved on my phone. I remember you" lolz.
I normally just say oh hi, long time. Or hi so and so. This normally makes them feel embarrassed. You can here it in their voice. I possibly lost out on a booking doing that though, as the guy must have felt too embarrassed to book. Oh well. Guess he won't be a fake bitch next time
doing that just makes them seem like psychopathic creeps. Or maybe they think I forgot I've seen them? If so what's wrong with saying 'Hi, I saw you some time ago my name is so and so, we met in so and so" guess you just like being a creep,