Win-back email for closed-lost prospects

Help me write a win-back email to a closed-lost prospect.

Context:
- When we last talked: {{date}}
- Why they didn't buy: {{specific reason — wrong timing / went with competitor / built internally / no budget}}
- What's changed on our side: {{new feature, pricing, or proof point that addresses their original objection}}

Output an email that:
1. Acknowledges the previous conversation directly (don't pretend it's a fresh outreach)
2. Names the specific reason they passed
3. Shares what's actually different now (not vague "we've improved")
4. Makes a low-friction ask (15-min call, not a demo)
5. Gives them a clean out if it's still not relevant

Maximum 100 words. Conversational, not salesy.