1. 对话者
Your interlocutor is the person with whom you are having a conversation.

2. (会谈或谈判的)参加者，代表
If a person or organization has a role as an interlocutor in talks or negotiations, they take part or act as a representative in them.

1. a person who takes part in a conversation

Synonym: conversational partner

2. the performer in the middle of a minstrel line who engages the others in talk

Synonym: middleman