假设你叫李华，你的一位朋友John刚从国外归来，邀请你参加本周日在他 家举办的朋友聚会，但你不能参加。请你根据以下要点给他写一封电子邮件：
1. 表达想参加的意愿；
2. 忙于准备期末考试；
3. 由于感冒，身体不适；
4. 表示歉意并另约时间。
注意：1.词数：100-120，开头和结尾已给出，不计入总词数；
2. 可适当增加细节，以便行文连贯；
Dear John,
I am extremely sorry to tell you that I am unable to go to your party this Sunday.
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
I 'm looking forward to your reply.
Yours,
Li Hua