Write a letter to a stranger thanking her for sending back your bag.
Dated : June 9, 200__
Dear Miss Agarwal,
I sincerely thank you for the trouble you had taken to return my bag.
Infact, I was very worried on account of some important papers contained in the bag but my joy knew no bounds on finding them intact.
I once again thank you for your kind gesture and also extend an invitation to come to my house for tea. Thanking you,