Most humbly, this email is to inform you that my name is __________ (name) and I am working as a _________ (designation) having employee ID _________ (mention ID). This email is in reference to the project assigned to me dated __/__/____(date) regarding __________ (name of the project).
I would like to inform you that due to ___________ (mention your reason), I will not be able to submit the project on the submission date. Therefore, I request you to extend the deadline as it will take _____ (days/weeks) more for the completion of the project. I hope that you will consider my request and accept the same.
Thank you for your time and consideration.