Add URL for when message is sent for Google Ad Trackigt

We want to track our conversions on Google Ads. I want a conversion to count when someone contacts us when someone goes to a listing and sends a message. A URL is needed for that. It can simply be a Thank you for submitting your info, we'll be in touch soon! - but that message opens up another tab with its own link. That link is what we can use for our conversion tracking for Google Ads. This would apply for any message to any business we added on our site. This is important to show our business clients we're bringing them business and at what rate. It also helps us know what it costs per conversion for ad spend tracking.