假设你是李华，于2010年6月3日搭乘国外某航空公司航班(flight number 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:陈述写信原因，简要描述该行李，说明其重要性，期待回复并表示感谢。

　　【参考范文】

　　Dear Sir/Madam ,

　　I’m Li Hua . I took the flight BA793 on June 3, 2010 . But when I came to my home , I found I lost a suitcase . I am writing to you to request you to help me find it back .

　　My suitcase is a small blue one with a zip . There is a label on the handle with my name and address on it . It is really important for me , because I had put all my important documents in it, including my ID card , passport and so on . Besides , it is what my father sent to me on my birthday .

　　Thanks for your kind consideration and I look forward to receiving your earliest reply .

　　Yours truly,

　　Li Hua