Example:
Dear Mrs. Worldly,
A young cousin of mine, David Blakely from Chicago, is staying with us.
May Pauline take him to your dance on Friday? If it will be inconvenient for you to include him, please do not hesitate to say so frankly.
Very sincerely yours,
Caroline Robinson Town.
Answer:
Dear Mrs. Town,
I shall be delighted to have Pauline bring Mr. Blakely on the tenth.
Sincerely yours,