Consider for a moment how your phone is currently being answered. Professional courtesy is quite often not the standard for many college students. An abrupt "Yeah!" could be listed among the more courteous greetings. The more outrageous remarks will often buy you a major black mark in the professionalism category—even if it was your roommate answering your phone and acting crazy. A simple "This is ____" is always a pleasant change for a college student call. Make the change today, before the next (or first) employer phone call. If you have a landline, you should also encourage your roommate to do the same.
21. Hello, you’ve reached the Sales Department at [X company]. We can’t take your call right now, but please leave your name, contact information, and the reason for reaching out, and one of our team members will be in touch within 24 hours.

Mention the details up front to notify callers of the situation immediately. If possible, specify which dates your office will be closed or when you will be back in business.
Recording professional voicemail greetings is easy but many people find it to be akin to public speaking, and are therefore apprehensive about starting. First of all, lets acknowledge the elephant in the room and just say that nobody in the history of the world enjoys the sound of their voices being played back to them. Once you can accept that, getting a professional voicemail greeting or Auto Attendant menu recorded will be a lot easier. To help you get the right tone and tenor of what you’re trying to communicate over you business voicemail, we’ve put together this handy list of resources for you.