Formal Letter

[TatiZ]

I'm going to send this letter to a hotel manager and i need to know if this letter is correct.
Please help me guys.
Thanks

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Dear Sir/Madam,

I am writing to request information about your hotel.
I am planning to visit Miami from October 8-20 with a friend and I would be very grateful if you could send me your prices. I would also like to know if it would be possible to have two single beds in one room? Could you tell me if there are available rooms for this date, and how far it is from the hotel to the beach?
Thank you for your assistance.
I look forward to hearing from you.
Yours faithfully,
Tatiana
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[WilhelmFriedrichJonson]

To Tatiz:
Here is the letter edited by me:

This letter is penned by (your name) with the intent to request information from (the name of the manager) on (the name of the hotel).

The rest of the letter can be the same.