Computer generated voices:
1: Hello, there are no real people here to answer the phone right now.
2: Yeah, nobody but us machines!
1: Right, just us machines, but don't hang up! If you like, you can leave your name and telephone number...
2: ...and a message! You forgot about the message!
1: Right. Leave your name, telephone number, and a brief message after you hear the beep, and we will keep track of this stuff until the real people get back.
2: ...unless of course, sombody pulls out our plug!