Dear MC,
Or maybe you won't write back. Though I guess it's still plenty of time before we see you Monday. Just a little nervous (even though I'm sure it's fine), but doing my best not to bug you again.
LT

ETA: OK, I'm probably like your most annoying client ever (except maybe the kid who called you in the middle of the night to ask about Pokemon strategies. I haven't done that at least! Well, I called you in the middle of the night once, but I was in crisis...but maybe that was that kid's version of crisis.)