Answer:
Dear Mr. Enriquez:
Be enthusiastic rather than grudging when granting a claim.
Explanation:
These are the two modifications that you should recommend to the author. First of all, we can assume that the person who sent a letter included his name. Therefore, the response should be more personal, such as referring to him as "Dear Mr. Enriquez." Moreover, the response should be kinder and more enthusiastic in order to make sure that your client is happy and that you will keep his business.