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 with Abby is on Sunday the 20th at 8:00 AM.
Example Output: agent

Example Input: Ok. Instead add meeting with Riles and her boss.
Example Output: user

Example Input: There are no attendees who have accepted "Open House Event". Unfortunately, Jake Cobb declined.
Example Output:
agent