Challenge: User Simulators are used to train task-oriented dialogue systems . traditional training paradigms rely on human-engineered agendas resulting in generated responses that lack diversity and spontaneity.
Approach: They propose a framework that leverages large language models to generate diverse responses . they use two LLMs to generate and verify responses, which are preferred by users .
Outcome: The proposed framework produces responses that exhibit diversity and are preferred by human users.

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Challenge: Large language models are increasingly seen as assistants, copilots, and consultants . however, their linear request-response format often makes interactions inefficient in multi-turn tasks .
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DIALIGHT: Lightweight Multilingual Development and Evaluation of Task-Oriented Dialogue Systems with Large Language Models (2024.naacl-demo)

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Challenge: DIALIGHT is a toolkit for developing and evaluating multilingual Task-Oriented Dialogue systems.
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Combining Discourse Coherence with Large Language Models for More Inclusive, Equitable, and Robust Task-Oriented Dialogue (2024.lrec-main)

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Challenge: Large language models (LLMs) are capable of generating well-formed responses, but they struggle in goal-oriented settings.
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A Survey on LLM-based Conversational User Simulation (2026.eacl-long)

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Challenge: Recent advances in large language models (LLMs) have enabled high-fidelity generation of synthetic user conversation.
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Transferable Dialogue Systems and User Simulators (2021.acl-long)

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Challenge: a lack of training data is limiting the development of dialogue systems . we develop a framework for creating dialogue data through self-play between agents .
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One Cannot Stand for Everyone! Leveraging Multiple User Simulators to train Task-oriented Dialogue Systems (2023.acl-long)

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Challenge: Recent studies have found that Task-oriented Dialogue systems can be more suitable for human users.
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An Improved, Strong Baseline for Pre-Trained Large Language Models as Task-Oriented Dialogue Systems (2025.findings-emnlp)

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Challenge: Recent studies have shown that Large Language Models perform insufficiently as TOD systems.
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Hello, It’s GPT-2 - How Can I Help You? Towards the Use of Pretrained Language Models for Task-Oriented Dialogue Systems (D19-56)

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Challenge: Statistical conversational systems are complex, timeintensive, expensive, and not easily transferable due to data scarcity.
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Real or Robotic? Assessing Whether LLMs Accurately Simulate Qualities of Human Responses in Human-LLM Dialogue (2026.findings-acl)

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Challenge: Recent work has sought to use large language models to simulate human-human and human-LLM interactions.
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DUAL-REFLECT: Enhancing Large Language Models for Reflective Translation through Dual Learning Feedback Mechanisms (2024.acl-short)

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Challenge: Existing self-reflection methods lack effective feedback information, limiting the translation performance of large language models (LLMs).
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