Termination In This Case

Hi jeeni,
Re: terminayion of apprentice
The letter shud read as follows:-
This is to inform you that vide letter dated ....................., Mr...................., Regn No................. has informed his inability to continue with the Appreticeship training with us , for which he was engaged. As per clause........... of the Contract of Apprenticeship, we on our part terminate the contract with immediate effect, which may please be noted.
Thanking You.

how to (letter format) inform to government department as the senior most person terminated by the company

I hope by senior most employee you mean the highest authority in the company and not the most experienced employee. In the former case the employee being a Managerial staff you need not inform the government of his termination. On the other hand if he is a workman then before such retrenchment you should have send notice to the government in form P of the Industrial Disputes Act. Please note that this intimation is required only for retrenchment cases and not for all terminations.
Regards,
Madhu.T.K