Underlying model of `having a conversation with a human`. This might range from simple voice recognition systems to more
complex natural language dialogues.
Some examples include timetables, search engines, advice-giving systems, and help systems.
Pros:
- Designed to allow those unfamiliar / afraid of technology to interact with a system in an intuitive way.
- Hands free.
Cons:
- Misunderstandings can arise when the system does not know how to parse what the human said.
- Can be annoying
- Unfulfilled user expections of system `intelligence`.
