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: Accept White Elephant Party but let them know I will be late.
Example Output: user

Example Input: Cancel my trip on March 5, 2020 at 8:00am
Example Output: user

Example Input: No. The event matching "sports meeting" is on Wednesday at 6:00 PM.
Example Output:
agent