(In a good Australian accent:) G'day mate. Can't come to the phone now because I'm a bit tied up with this crocodile. Just leave a message, and I'll get back to you.
You have reached 843-4734. Please hold while I process your call. (Pause.) Our extremely sophisticated computer system performed a trace on your number and was able to match it with our list of important callers. None of our staff is authorized to speak with you except for Fred, who is not here right now. Please leave your name phone number and a brief message at the tone. Thank you for calling and have a nice day.
I can't come to the phone now because I have amnesia and I feel stupid talking to people I don't remember. I'd appreciate it if you could help me out by leaving my name and telling me something about myself. Thanks.