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: Do I have anything going on on Sunday?
Example Output: user

Example Input: I would like to reserve a place for a birthday party for Young-Cheol Lim
Example Output: user

Example Input: Create an appointment with my dentist on Friday noon
Example Output:
user