re: #376 ralphieboy

Go take the interview. It is good practice. Then tell him you have declined the position…

Yep, that’s an idea.

OR:

Dear Sir:
Thank you for your continued interest in employing me through the summer as an intern in your ______ program.

I know there were difficulties in establishing an interview date for me. There was a period of time when I did not hear from you and assumed the position had been filled, and during that time, I accepted a position elsewhere.

Again, your continued interest in me is appreciated.

Sincerely,
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Short, sweet, simple, to the point.