假设你是李华,于2010年6月3日搭乘某航空公司航班（flight number BA7930)回国后遗失行李箱,用英文

To whom it may concern(or dear staff of xxx airport):
thank you for your time to read this letter.i am really sorry to inform you that i have left my luggage bag behind in your airport,and now i wish that you can help me find it.the flight number is BA7930 and the boarding time is June 3,2010.
it is a 75x40x25cm,black bag,with a brandname called Uris bags.in it there are just some pieces of summer wears and swimming suits.
but besides these mentioned above,i had put my wallet and some business papers in it when i got boarded.now these papers are in urgent need to be submitted.so it is very critical to be able to find it.
because of my carelessness,i have left it in the lounge when i went to buy something as souvenir.but when i returned there,i found my bag gone already.later,i called the police,but they said it took time.
due to its importance,i have no other idea but to place my hope on your finding it in the airport.please do me a favor and i would be heartily grateful to your kindness,no matter it would be found or not.
please allow me to give my sincerest thanks to you,for your kindness of helping me find the bag.
best wishes,
hua li
June 4,2010