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: Ok, I won't do anything for now. Let me know what else I can help you with.
Example Output: agent

Example Input: Yes, that looks right! Thank you.
Example Output: user

Example Input: These are not what I want
Example Output:
user