The present disclosure provides a method for, in order to achieve a predetermined goal, determining a goal achievement prediction probability at a particular time point in process of a conversation session between one user terminal among multiple user terminals and a conversation understanding AI service server on a conversation understanding AI service server configured to process a natural language conversation for each of the multiple user terminals. A method according to the present disclosure comprises the steps of: receiving a natural language input from a user terminal at a particular time point; determining an intent corresponding to the received natural language input; determining a conversation history at the particular time point, wherein the conversation history indicates a flow of intents between the user terminal and a conversation understanding AI service server generated to the particular time point in a conversation session and includes an intent determined at the end of the flow of the intents; determining at least one conversation pattern including the conversation history among conversation patterns on the basis of the conversation history and a template prepared in advance for the conversation understanding AI service server, wherein the template includes multiple conversation patterns, each of which represents a flow of corresponding intents, and each conversation pattern has the number of times of goal achievement success and the number of times of goal achievement failure; and determining a goal achievement prediction probability at the particular time point on the basis of the corresponding number of times of the goal achievement success and the corresponding number of times of the goal achievement failure of the determined at least one conversation pattern.
METHOD FOR DETERMINING OPTIMAL CONVERSATION PATTERN FOR GOAL ACHIEVEMENT AT PARTICULAR TIME POINT DURING CONVERSATION SESSION ASSOCIATED WITH CONVERSATION UNDERSTANDING AI SERVICE SYSTEM, METHOD FOR DETERMINING GOAL ACHIEVEMENT PREDICTION PROBABILITY, AND COMPUTER-READABLE RECORDING MEDIUM