Dear Sir/Madam,
I am writing this email to inform you that my name is ___________ (name) and I am working as a ____________ (designation) in _____________ (company).
This email is in reference to the ________ (telephonic conversation/meeting/other) dated __/__/____ (date). In this regard, I request you to provide me with a formal purchase order for your requirement of ________. Formal purchase order from your side will help us execute your requirement at the earliest.
I hope that you will accept my request for issuance of purchase order. If you wish to contact us, you can reach us at ________ (mention contact details).
Best Regards,
___________ (Name),
___________ (Designation),
___________ (Contact details)