My name is _________ (name) and this email is in reference to the property booking ID number is __________ (mention booking number).
I write this email in order to inform you that I had booked a property with ______________ (address/ ID/ number) on __/__/____ (date) and I have completed all the formalities in this regard. I want to inform you that the possession date for the said property handover as per the documents is ____________ (date/ term) but, unfortunately, the same has not yet been done.
Therefore, I write this to complain and also request you to kindly get the same done at the earliest. I shall be highly obliged for your kind support.
_________ (Your name),
_________ (Contact Number)