Dear _________ (name),
This is to most humbly inform you that I am __________ (name) and I am a resident of ___________ (location).
I would like to inform you that I am writing this email in order to request you issue a guarantee letter in my name. I am in need of this letter for ___________ (mention purpose) I shall be highly obliged if you could issue the same at the earliest.
In case of any queries, you may contact me at the contact details mentioned below.
__________ (mention name),
__________ (contact number)