I don't want to miss my appointment at 2 pm; can you alert me 20 minutes before?
[IN:CREATE_REMINDER I don't want to miss my [SL:TODO [IN:GET_TODO [SL:TODO appointment ] [SL:DATE_TIME at 2 pm ] ] ] ; can you alert [SL:PERSON_REMINDED me ] [SL:DATE_TIME 20 minutes before ] ? ]