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: Are my Salsa lessons scheduled next week?
Example Output: user

Example Input: Yes, that's good! Decline my invitation to go on a Brewery Tour with Thomas and tell him that I'm going to the Water Park that day.
Example Output: user

Example Input: Change the ending time of the event to 9:45 PM.
Example Output:
user