Thank you for the clarification.
So this would be a memo confirming your discussions with him that you are not renewing the contract after it expires.
MEMO [or letter]
SUBJECT: Confirmation and Notice to Not Seek Renewal of Existing Employment Contract.
This memorandum will confirm our discussions of [DATE] that I will not be seeking to extend the renewal of my employment contract as [name of position] at [Name of company]. My contract is set to expire on [DATE]. I will continue to work for the balance of my contract.
As per our discussions you are aware I have accepted a position with another company to begin after my contract has ended here. I am looking forward to my new position and the challenges that await me. I am very greatful for the opportunity you have given me here and I am here to support you in anything you need from me.
Please feel free to contact me at any time should you have any questions, need me to help out with anything or to assist my replacement with training.
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