write a letter to a stranger thanking him for returning your bag which you lost while travelling in bus.IS IT A FORMAL OR INFORMAL LETTER

Dear Student,
Your question is not quite correct as it is impossible to write a letter to a stranger since he/she is unknown to you. The correct word to be used for such a question (since the strange person has helped you) is Good Samaritan.
The letter will be an informal letter, however , the language will be polite and distant. 
You will thank the person for his kindness and extend your helping hand in any time of his/her need.
You can refer to the format of an Informal letter on our website.

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