5. You have reached [your business]. We are currently closed. Our normal hours of operations are from [hours] [days]. We are closed on [days]. Please leave us a message with your name and number and we will return your call when the office reopens. You may hang up after leaving your message or press the [key] for additional options. Thank you for calling.
The difference between writing a script and writing for print is that scripts must be written for the ear and written for effective delivery by voice talent. It must be written in a conversational tone. When you create a script that’s listenable, your callers will better understand your business.

Here are some proven techniques for how to leave a voicemail message that gives you the best chance of getting a call back: Say the person's first name ONLY. Say your first name only followed by your company name. Keep your voicemail brief and urgent. Leave a reference name of a person and company you've worked with. How do you answer the phone professionally? Promptly answer calls. The average ring takes 6 seconds. Be warm and welcoming. Introduce yourself and your business. Speak clearly. Do not use slang or buzz words. Ask before you put people on hold. Don't just put calls through. Be prepared for your calls. How do you greet a client over the phone? Answer your phone with a "Hello" if you don't know who it is. Greet the caller by name if you know them. Use informal language with family and close friends. Introduce yourself by name when you call someone else.
You don’t have to spell out every single thing that you think they might want to know. Have some faith that your callers will be able to figure things out on their own. Be natural but informative.