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: Change it to 3pm actually.
Example Output: user

Example Input: Elli Parker has no direct reports.
Example Output: agent

Example Input: What all do I have that day that is longer than 30 minutes
Example Output:
user