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: Update my appointment to 1:00 pm.
Example Output: user

Example Input: All right. Repeat this search for the third week of November.
Example Output: user

Example Input: I think that will be ok.
Example Output:
user