9.) Bienvenido/a a John Doe. Lo sentimos, en estos momentos no hay nadie en nuestras oficinas. Por favor, déjenos un mensaje con su nombre y número de teléfono tras escuchar la señal. Le devolveremos la llamada tan pronto como sea posible.
Hello, you have reached the dental office of Dr. X. We are busy assisting a patient now, but will call you back as soon as possible. Please leave your name, reason for calling, and your number. If this is an urgent enquiry, please call 911. In this case, the dentist is giving a reason for not being available and they’re providing a way to prioritize the patients who need the most help. They’re also leaving an emergency number for the most severe of situations.

Voicemails need to maintain a professional consistency that’s aligned with the entity it’s representing. That said, the structure can vary depending on the situation. There’s no template set in stone. In fact, trite and generic should be off the table. The goal should be a balance of uniqueness and practicality.
Keep in mind that to enjoy the full benefits of your professional greeting system, you must routinely check and delete messages. If your voicemail fills up, you won’t be able to receive new messages, meaning your customers will become frustrated.