Answer:We request a brief extension to complete the report.
Explanation: The language should be presented in a form of request,it has to be seen as one pleading for more time rather than making it in such a way as to show some harshness. This harshness or unfriendliness makes it a negative tone it should not be presented in a tone which signifies blame, complain or pride etc.
Positive courteous language helps to promote effective relationship and encourage people to assist in difficult situations.