Thank your for inviting us to visit your showroom during winter sales event on December 01-04.
After reading your offer leaflet, we shall like to purchase the following items, so please reserve them for us.
Judging by the date, I would guess you missed the sale. Just kidding. "
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Judging by the date, I would guess you missed the sale. Just kidding. Add "the" before "winter" and use "would" instead of "shall."