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: Here are some times when you and Kim are free.
Example Output: agent

Example Input: when is Halloween?
Example Output: user

Example Input: After that, can you schedule ice cream for 1600?
Example Output:
user