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: now delete the general meeting event for 23rd
Example Output: user

Example Input: Do I have anything tomorrow at 4pm?
Example Output: user

Example Input: I've deleted your event matching "romantic walk on the beach" Trey on Sunday.
Example Output:
agent