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".

Example Input: Block off two hours next Wednesday at 3:00 pm for a Dentist Appointment, and set my status as Out of Office.
Example Output: user

Example Input: I've changed "Confession to my Priest" to be at 8:00.
Example Output: agent

Example Input: Let's put drinks with the guys after the football game
Example Output:
user