Hi Daniel.....How are you? How is the graduate doing? :) Well I hope. We miss you here at [HS-NAME].....you were a great student  and we are sad to see you go. :(
I have called IT a few times and left message. Just wondering if they have happened to contact you.  Let me know and if not I will continue to call. Hopefully I can reach [IT-DIRECTOR-NAME] directly......
Hope this finds you well Daniel......talk to you soon.
Ms. [TEACHER-NAME]
[HS-NAME]