Table 1: Speech act triplets for dialogue 1.

Tempo tUser speech act (t)Chatbot speech act ( 𝑡 + 1 ) User speech act ( 𝑡 + 1 )

−1 Expressive-Neutral
0 Expressive-Neutral Expressive-Neutral Directive-Neutral
1 Directive-Neutral Directive-Neutral Assertive-Neutral
2 Assertive-Neutral Commissive-Neutral Expressive-Neutral
3 Expressive-Neutral Assertive-Neutral Expressive-Neutral
4 Expressive-Neutral Expressive-Neutral