Hi it's <NAME> at <COMPANY> how are you, nice day isn't it?
Hey it's just a quick call, there's an open home at <ADDRESS> on Sunday and I didn't know if you could make it?
Hey its been great to chat with you, would it be ok to keep in touch?
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Your number is in the White Pages, and I just wanted to let you know about your neighbour's open home. By the way is there anything I can help you with?