по английскому 5 всегда была
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Dear Sir/Madam,
Thank you for the brochure.
I would like to reserve an accomodation for a family in your hotel.
We are arriving on Sunday,10th August and we are leaving on the 20th August
(Можно добавить : I would like to reserve an accomodation with the phone, with the TV set and a double bed)
I have inclosed a cheque for a deposit of 500$, as you requested
Please, Let me know what documents you need to confirm the reservation.
I look forward to hearing from you.
Yours faithfully.
(Name,Surname)
Примечания : формальное письмо такого рода пишется без сокращений и еще нужно соблюдать абзацы