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: I didn't find any events on Thursday the 29th after 11:30.
Example Output: agent

Example Input: The time is currently 1:24.
Example Output: agent

Example Input: You have one event on your calendar. The annual family gathering is on December 23rd from 3:00 to 5:00 PM.
Example Output:
agent