Reading Between the Lines: The One-Sided Conversation Problem

Victoria Ebert, Rishabh Singh, Tuochao Chen, Noah A. Smith, Shyamnath Gollakota


Abstract
Conversational AI is constrained in many real-world settings where only one side of a dialogue can be recorded. We formalize the one-sided conversation problem (1SC): inferring and learning from only one side of a conversation. We study two tasks: (1) reconstructing the missing speaker’s turns and (2) generating summaries from one-sided transcripts. Evaluating models on MultiWOZ, DailyDialog, SpokenWOZ and Candor with both human A/B testing and LLM-as-a-judge metrics, we find that additional context improves reconstruction, and while large models generate promising reconstructions with prompting, smaller models require finetuning. Further, high-quality summaries can be generated without reconstructing missing turns. We present 1SC as a novel challenge and report promising results that mark a step toward privacy-aware conversational AI.
Anthology ID:
2026.findings-acl.1757
Volume:
Findings of the Association for Computational Linguistics: ACL 2026
Month:
July
Year:
2026
Address:
San Diego, California, United States
Editors:
Maria Liakata, Viviane P. Moreira, Jiajun Zhang, David Jurgens
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
35227–35260
Language:
URL:
https://preview.aclanthology.org/ingest-acl/2026.findings-acl.1757/
DOI:
Bibkey:
Cite (ACL):
Victoria Ebert, Rishabh Singh, Tuochao Chen, Noah A. Smith, and Shyamnath Gollakota. 2026. Reading Between the Lines: The One-Sided Conversation Problem. In Findings of the Association for Computational Linguistics: ACL 2026, pages 35227–35260, San Diego, California, United States. Association for Computational Linguistics.
Cite (Informal):
Reading Between the Lines: The One-Sided Conversation Problem (Ebert et al., Findings 2026)
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https://preview.aclanthology.org/ingest-acl/2026.findings-acl.1757.pdf
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