Creating an event with a custom reminder in 1 e-mail?

I'd like to create an appointment or todo with a custom reminder time using a single message to Sandy. So I'd like to, for example, schedule an appointment at 12pm and have Sandy remind me at 9am. I realize that I can create an appointment, then go to the site and edit it, or I can reply to Sandy's response with "update #1 remind me at 9am."

Since the functionality is there, I was wondering if there was some syntax I was unaware of to tell her to create an appointment at 12 with a reminder at 9 in one fell swoop.