Use these 5 techniques to not only sound natural on the phone, but to also close more business: #1 – Always use the prospect’s first name. I know that there are two schools of thought on this, one being that you should show respect for someone you don’t know and so use either Mr. or Mrs., but I don’t agree.
Don’t rush. It’s important to speak slowly and clearly when leaving your next voicemail greeting. Have you ever called someone and the message sounds like one big word? Don’t be that guy. Pronounce your words and take pauses between your sentences

36. Hello. You’ve reached the office of [your name] at [your company]. I will be out of the office from [date] to [date]. Please leave your contact information with a brief message, and I will call you back as soon as I have the chance. If you need to speak with someone urgently, please contact [name of colleague] at [email or phone number]. Thanks for calling.
To sound professional, you’ll also need to practice your greeting until it sounds completely natural. Having a natural and professional greeting will put the person you’re talking to at ease and will signal that you know what you’re doing. Make sure it is not long-winded and insincere. Try something short and to the point like “Hello.