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: Yes, Steven has accepted the "golfing" invitation.
Example Output: agent

Example Input: great, why not an extra 15 minutes on top of that
Example Output: user

Example Input: No, I didn't find any events on your calendar.
Example Output:
agent