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: The event "returning flight" is on Tuesday the 17th at 12:00 PM.
Example Output: agent

Example Input: Yes, but I also need you to remove Lynne and Andrea also.
Example Output: user

Example Input: set an event for meeting with Jim's boss tomorrow at 11 am.
Example Output:
user