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: also schedule Ryan's Wedding March 16 2019 at 2 pm
Example Output: user

Example Input: Yes, that looks right! Thank you.
Example Output: user

Example Input: Here are some times when you and Kathy are free.
Example Output:
agent