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 Dan Schoffel are free.
Example Output: agent

Example Input: Yes, I found one event on Monday the 22nd. It's "Appointment" from 11:59 to 12:01 AM.
Example Output: agent

Example Input: Cancel today's lunch and set up a meeting with Jim for nine AM tomorrow; make it for an hour, you'll need to push back the meeting with Julie by half an hour.
Example Output:
user