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Dear Mary Thank you very much for the invitation to your birthday party, I'd like go to the party, It must be fun. But i have to buy my son's school uniform and send him to his school because that day is his rigister day. After that I have to rush to the ariport to meet my friend, she will come here and we haven't see each other for ten years. I will show her around this city untill she leave by the evening flight. So I can't go to your party.I'm so sorry to tell you that.