I caught this on a recent dinner out during a weekend with friends. I think the comma is unnecessary–it should be a period–and the wording at the end is confusing. Taken literally, I am encouraged to ask my server to purchase a gift certificate. So I would say “Dear Server, please purchase me a gift certificate” and the server would purchase a gift certificate and give it to me for future use. Perhaps it should say “Ask your server about purchasing one.”
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