An effective opener for a message replying to a customer's request might be Yes, our retreat facilities, which can accommodate 126 people, are available on March 9-12, 2018.

Question

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The first line of the given text is an effective opener for a message replying to a customer's request. It is clear, concise, and provides the customer with the information they are looking for.

An Effective Opener for a Message Replying to a Customer's