Interlocution

[T]wo actors were introduced to sustain fictitious characters and carry on a dialogue in such manner that the songs of the chorus and the interlocution of the actors formed a continuous piece.

Source: wiktionary

Contrary to Storra's hope, however, the conversation between Flinx and his new visitor was going very well indeed. ¶Experienced in the ways of political intrigue, if not interspecies interlocution, Treappyn had settled himself into a comfortable squat.

Source: wiktionary