Buscar la conversación

private fun getConversation() {
    client.getConversation(CONVERSATION_ID, object : NexmoRequestListener<NexmoConversation?> {
        override fun onSuccess(conversation: NexmoConversation?) {
            this@MainActivity.conversation = conversation
        }

        override fun onError(apiError: NexmoApiError) {
            conversation = null
            Toast.makeText(this@MainActivity, "Error: Unable to load conversation", Toast.LENGTH_SHORT)
        }
    })
}