TASK DEFINITION: In this task, you are given an utterance, which is a part of a conversation between a user and an agent. Your job is to detect the speaker. The user usually commands the agent to schedule events, retrieve event information, and check the schedule. While the agent's response is an answer to the user's questions or follow-up questions on the user's command. Answer with "User" or "Agent".
PROBLEM: For "meeting with Karl boon", barack obama and fiona mason will join as well

SOLUTION: user

PROBLEM: What about my appointment on Thursday with Glob?

SOLUTION: user

PROBLEM: I'd like you to add a Dr. appointment to my schedule.

SOLUTION:
user