Mistaken Identity: The Persistant Businessman

I received the following email a few days ago:

thank you for your site.i want to aske you about companies ( manufacturers ) in egypt produce (stone crusher ) pumice material that used for lightweight concerte construction.thanks.

This is in reference to my article about the origin of some pumice deposits on the South East Mediterranea shore. That article is mainly about childhood memories and scientific curiosity. After I reply that I have no idea on that, a few days pass, then I get a similar query from the same person:

thank you for your site.i want to know moer about pumice material that used for lightweight construction ( the price per ton and the minimum quantity ) producers ( companies ) in egypt

What should I reply and say?

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