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".

Here are some times when you, Alice, and Jonathan are free.
agent
The utterance is from the agent to the user, so it is not a command to schedule an event. It also does not ask for any information or follow-up questions on the user's command. Therefore, this utterance is an answer to a question or a follow-up question.".