It's a task-oriented dialogue system. It is intended to engage a sympathetic and highly cooperative human in an English dialog, directed towards a specific goal within a very restricted domain of discourse.

Genial Understander System(GUS)

It's also called domain ontology. It's a kind of knowledge structure representing the kinds of intentions that the system can extract from user sentences and consist of a collection of slots, each of which can take a set of possible values.

 Frame(In Task-Oriented Dialogue System)

- Absolute task success (for simple, ambiguous tasks; was it done correctly?)
- User satisfaction rating
- Task completion success
- Task error rate
- Efficiency cost

Ways to Evaluate Task-Based Dialogue Agents

Task-oriented dialogue agents are designed to aid users in completing structured tasks, such as answering questions and making bookings

Carleton College

1) Chatbots

2) Task-oriented dialogue agents

Types of Dialogue Systems

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

Speech and Language Processing (3rd ed. draft) 

Chatbots are designed for unstructured conversation, and are meant to mimic natural back and forth human dialogue

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