If you’re going to start with a common statement such as ‘Your call is important to us’ and the other statements you have heard, your prospects are going to walk away.
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.

"I'm sorry�" followed by the mailbox owner's name (as recorded by the owner or administrator), then "�is currently on the phone" and then the fixed system prompt, "Begin speaking after the tone, then hang-up when you are finished or press any key for further options."
Optimum is the first landline telephone service provider in the U.S. to launch High Definition calling. HD calling is the next generation of voice technology that gives you less background noise, sharper sound quality and increased clarity in your phone conversations. To experience HD calling, customers and call recipients must subscribe to Optimum Voice and use HD-capable handsets.