True to an extent. This depends on where the prospect came from.
Situation could be:
Corporate event, and a Caterer or other vendor referred you. Client did not look at your website. They called you directly. Their maximum budget came up during your conversation, Or they told you after you gave them a price quote.
YOU don't participate with internet leads, but the prospect could be a lead, and the event is on a open Saturday or perhaps a Friday that you still have open 1 or two months out. This prospect has obviously never looked at your website.
Essentially, it seems like you are in the "Automatically dismiss the lead because they are not your client" Camp. You would likely just tell them your starting price, and your price list is on your website, and have nothing more to say if it's a phone call to you. Or would you have a more in depth conversation with them, and try to convey why you are worth paying your price in order to book with you?