Simply replace the unfilled areas such as "" and "[date]" with your information.
Dear [name of lender],
In light of the current financial crisis, I'm seeking a revision of my loan terms. Specifically I'm looking for the following:
[describe terms, i.e. reduction in interest, reduction in monthly payments, revision of loan amortization]
The reasons I need these revisions are as follows: [describe reasons, i.e. loss of employment, hours, or reduction of wages]
I appreciate your attention in this regard and thank you in advance for your prompt response.