Professional voicemail greetings are considered extremely important in the corporate sector. An ideal voicemail greeting should educate the caller about the destination he/she has reached, why is the receiver not available and when can he/she expect a call back. Below are some examples.
What voice do you want to convey when speaking with customers? This may be professional, casual, or even humorous.

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.
Sometimes, it’s best to pick up the phone instead or have a face-to-face meeting if the tone or topic of the email is emotional, terse, or needs a lengthy discussion. Responding to workplace texts: You don’t have to have the last word. But if you need to say thanks or okay, say ‘thank you’ or ‘okay’ rather than ‘thankU’ or ‘k.’