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: What meetings do I have next week with Sarah?
Example Output: user

Example Input: Put a meeting with Jack on my schedule for tomorrow at 1pm.
Example Output: user

Example Input: Here are some times when you and Kim Possible are free on Friday the 13th.
Example Output:
agent