It means deciding the topic. Is it about the calender, academic performance or others.

Domain Classification

It decides what general task or goal is the user trying to accomplish?

Intent Determination

It extracts the particular slots and fillers that the user intends the system to understand from their utterance with respect to their intent. 

Slot Filling

1. domain classification
2. intent determination
3. slot filling

University of Michigan - Ann Arbor

A Frame-based Dialogue System defines a dialogue frame structure and the formatted involved important components.

Frame-based Dialogue System

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

Speech and Language Processing (3rd ed. draft) 

It's with high human cost and hard to transfer to other domains.

Disadvantages of Frame-based Dialogue System

Main Components Extracted by Frame-based Dialogue System

NLG Module of Frame-based System

Automatic speech recognition is a sequence-to-sequence learning task where the input sequence is an audio recording of a speaker and the output is a text transcript of the spoken words. A significant challenge in this domain is that there is no one-to-one correspondence between audio frames and text, as thousands of audio samples may correspond to a single word, making the input sequence much longer than the output sequence.

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