Hi [Recruiter Name],
Thanks so much for sharing this opportunity with me! While this is not aligned with what I'm currently looking for, I would love to stay connected with you and be kept in mind for future opportunities with [Company Name].
Thanks again and I look forward to staying connected!
Best,
[Your Name]
Hi [Recruiter Name],
Thanks for reaching out! Although I have already accepted another offer for this summer, I think [Company Name] is doing amazing work; I would love to be kept on your radar should any future opportunities become available.
Once again, thank you for the opportunity and have a great weekend!
Best,
[Your Name]