Dear S,
I hope you're doing well and enjoying your summer.
This is A (X L) from B. As L suggested, I’m sending over my CV and certificate for your consideration (please see the attachments).
Working with L—and the rest of the team—has been a real pleasure. I appreciate everyone's kindness and support under his leadership. If any suitable opportunities arise, I’d be grateful if you could keep me in mind.
Many thanks for your time.
Warm regards,
X (A)