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: rain makes me sad
Example Output: user

Example Input: I also need a room reserved at NERD for a nerd conference at 9 tomorrow
Example Output: user

Example Input: Yes, I found one event tomorrow. It's "Unemployment Appointment" from 9:00 to 9:30 AM.
Example Output:
agent