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: What meetings do I have next week with Sarah?
Example Output: user

Example Input: Sorry I can't help you with that. I can look up businesses and locations, and give you information about them.
Example Output:
agent