Subject: [[mutual connection]] recommendedation

Hi {{first_name}},
[[Mutual connection name]] recommended I get in touch.
I recently helped [[referral’s company]] hire for a similar role to the [[position]] that you are currently recruiting for. I’m getting in touch to see if you’d be open to a quick discussion to see if I can offer you the same service?
I am flexible with my availability. Let me know when works for you.