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".

I am looking to schedule an event after brunch
user

What days are marked as out of office for April?
user

Can you mark me as busy until noon the following day?

user