This s juz a suggestion you can alter this as per your requirement:
Dear XXXXXXXXXX,
This is to inform that you have failed to perform your duties properly by not performing the task assigned to you but also mislead the project lead when you claimed that you had completed the set of tasks that were assigned to you.
Also, you were found using your personal e-mail Id to chat with outsiders. This is against the regulations of our organization.
From this date forward, you are expected to be more responsible and comply with the rules and regulations of the organization. Further incidents of this nature will invite strict disciplinary actions against you.
From Bahrain, Manama
Dear XXXXXXXXXX,
This is to inform that you have failed to perform your duties properly by not performing the task assigned to you but also mislead the project lead when you claimed that you had completed the set of tasks that were assigned to you.
Also, you were found using your personal e-mail Id to chat with outsiders. This is against the regulations of our organization.
From this date forward, you are expected to be more responsible and comply with the rules and regulations of the organization. Further incidents of this nature will invite strict disciplinary actions against you.
From Bahrain, Manama
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Sample warning letter.doc