You are lucky if you get this reply from a potential customer,
"We aren't able to use your product right now, but please take my email and send me information because we would like to be able to plan for it."
The correct response can come in many forms. It does not, however, sound like this:
"Well we don't send out information. That would be a waste of time for us."
Because, as it happens, any follow up response from said potential customer (SPC) will include a short but sweet declination of your services ending with the statement, "because that would be a waste of time for us."
Furthermore, when you then give out your website address, SPC will not even pretend to write it down. She will, though, roll her eyes at the not-quite-cleverly misspelled name of your company before hanging up.