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: I've changed "Appointment" to be for 15 minutes.
Example Output: agent

Example Input: Coud you please delete my event thats at brunch tomorrow?
Example Output: user

Example Input: You have not responded to the "Adopt a Maltese" invitation.
Example Output:
agent