Greetings. You’ve reached the office of [Name]. I’m either out of the office or gone for the day. However, your call is extremely import to me, so I’d appreciate it if you’d leave your message, along with your contact information, at the sound of the beep. Thank you for your call.
Some people, even most people, would always rather just speak to a person first, rather than listen to a recording of your office directory or department extensions. If you want to offer the operator first, try this:

An attractive voicemail can be a major factor in appearing professional and legitimate to the outside world. When recording a professional voicemail for your business, your validity is evaluated subconsciously by those who call you. Don’t make the mistake of overlooking this simple yet valuable component of your brand!
3.) Bienvenido/a a John Doe. En estos momentos no podemos atender su llamada o nos está llamando fuera de nuestro horario de oficina. Por favor, déjenos un mensaje con su nombre y número de teléfono, le devolveremos la llamada lo antes posible. Gracias y hasta pronto.