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: Yes, I found one event not matching "Training" on Thursday the 23rd. It's "Biz prep" from 8:00 to 8:30 AM.
Example Output: agent

Example Input: The next event matching "get together" with Arnold is on Monday the 21st at 5:00 PM.
Example Output: agent

Example Input: If Jenny is on the sales call at noon tomorrow please remove her.
Example Output:
user