假定你是李华，于2014年4月1日搭乘国外某航空公司航班(Flight BA793)回国后，发现遗失了一个行李箱（suitcase）现请用英文给该航空公司写一封信，请他们帮你寻找。
信件要点包括：
1.陈述写信原因;     2.简要描述该行李;   3.说明其重要性；4.期待回复并表示感谢
注意：1.信件格式已经给出，不计入总词数；2.词数120左右
Dear Sir or Madam， 
                                                                                             
                                                                                            
                                                                                            
                                                                                            
                                                                                            
                                                                                            
                                                                                            
                                                                                            
                                                                                            
                                                                                            
                                                                                            
                                                                                            
Best wishes,
Yours truly,
LiHua