No need to apologize - I am happy to reschedule.
Thank you for a quick reply, however, I must apologize to you–I now have a work related scheduling conflict which makes the 10 P.M. start on both slots impossible–I am sorry. Can you start earlier by at least three to four hours? Would it be at all possible to begin at 6 P.M. or 7 P.M. on Wednesday (EST)?
Wednesday 7PM EST would be more convenient for me. Is that okay?