请借助以下表格内的信息帮Jack 写一封邀请信。                                                                                                                                                                         

To	Activity	Date	Place	Time		From	Jack's phone number
Sam	birthday party	Tuesday, July 18th	Baiyun Pack	arrive	begin	Jack	020-36301528
				7:00 p.m.	7:15 p.m.

Dear Sam, ___________