Hello, you have reached Dr. A. We are busy assisting patient on the another line. Please, leave your details, including the case number if applicable, name, and phone number. For a medical emergency, hang up and call 911.
A general voicemail greeting is what callers will be greeted with if you are unable to answer the phone at work. It is the everyday greeting, used as the default, unless you have set up a temporary greeting, such as an away message while you're on vacation, or a special message during a holiday.

Avoid using ‘please’ more than once, it gets wordy and redundant. The goal is to keep the content as concise as possible, moving callers quickly and seamlessly through the options.
Friends and colleagues speak to each using first names only. So do people of authority. They do not call each other and leave voicemail messages asking for Mister, Miss, or Mrs. Therefore, when you call a person you want to do business with and you leave a voicemail message, refer to them by their first name only. Don't say mister, miss, or misses. Don't say their last name. Begin your voicemail message by saying only "hi/hello" followed by the person's first name. Or, you can even forget the "hi/hello" and just say the person's first name. That is how you show confidence and authority and separate yourself from weak salespeople.