Discourse Analysis

it is a form of interactive, spontaneous communication between two or more people. Typically, it occurs in spoken communication, as written exchanges are usually not referred to as conversations.

Reciprocal action or influence:
e.g. ongoing interaction between the two languages

special words which are used to begin the conversation 

an utterance that has performative function in language and communication

refers to the process by which people in a conversation decide who is to speak next. It depends on both cultural factors and subtle cues.