Could you please check this guest reminder if it sounds natural in English?
Gentle Reminder
Dear Guest,
For the sake of your personal and hotel safety, please abstain form smoking while lying on the bed. If you smoke, please put out the cigarette in the ashtray.
Our rooms have wooden flooring and carpets, disposing cigarettes carelessly may lead to the outbreak of fire, threatening your personal safety and belongings. We would like to remind you that if there are any damages to the wooden flooring and carpets from the cigarette during your stay, there will be additional charges for the damages.
Please dispose the cigarette properly in order that there would not be any unintended charges. Thank you for your consideration and support for our hotel.
Note: If there are more than 15 cigarette markings on the wooden flooring or carpet, the price of the whole wooden flooring or carpet of the room will be charged.