The difference between responsive and interactive speaking is in the length and complexity of the interaction, which sometimes includes multiple exchanges and/or participants. Interaction can take the two forms of transactional language, which has the purpose of exchanging specific information, or interpersonal exchanges, which have the purpose of maintaining social relationships. (in two dialogues cited above, A was transactional and B was interpersonal). In interpersonal exchanges, oral production can become pragmatically complex with the need to speak in a casual register and use colloquial language, ellipsis, slang, humor, and the other sociolinguistic conventions.