Please read the comments and fill what's in brackets before sending.
Hello [name],
Thank you so much for applying to our organization! We appreciate and recognize your time and patience. Our applicant pool this spring was incredibly talented and it was very difficult for us to select our incoming class for this semester. After careful consideration, we regret to inform you that we are unable to offer you acceptance to Spark SC at this time.
This is not the end of the road, however. We appreciated {good thing}. We were also very impressed by the work you've done in {arena}. At the end of a tough deliberation cycle, we determined that we need to understand more about {your relationship to Spark's mission}. We hope to see you back again next semester and wish you the best of luck on all of your endeavors!
Please know that we want you to be a part of the extended Spark family in the meantime — our events are open to all and we'll let you know when those are happening. We hope to see you around!
Sincerely,
Spark SC