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: That's the ticket; thanks so much!
Example Output: user

Example Input: How many meetings do I have next week?
Example Output: user

Example Input: I need to update that to Starbucks
Example Output:
user