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: Schedule a Party at 8 am until midnight.
Example Output: user

Example Input: Actually, just let them know I will be out for half the day.
Example Output: user

Example Input: Cancel my dinner date with Frederick next week Wednesday.
Example Output:
user