When a search finds nothing, Pro can show a short form so the visitor can leave their name, e-mail, phone and a message instead of leaving the site. Turn it on under Sanvador Store Locator → Pro → Contact form with Show a contact form when a search has no results.
Requests are e-mailed to the addresses under Send requests to (separate several with commas; empty means the site admin address). You can change the Form heading.
All requests are listed under Sanvador Store Locator → Requests with what the visitor searched for. Mark them as handled, or click Download CSV. The form has spam protection without a captcha and a consent checkbox, and works with WordPress’s personal data tools.