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: Can you move my one on one with Jenna by two hours tomorrow?
Example Output: user

Example Input: I found one event with Sarah. It was "Meeting with Sarah and Damon Straeter" from 4:00 to 4:30 PM.
Example Output: agent

Example Input: It's perfect
Example Output:
user