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".

[EX Q]: The event matching "Amanda's birthday party" next week is on Tuesday the 8th at 11:00 AM.
[EX A]: agent

[EX Q]: Here are some times when you and Dan Schoffel are free.
[EX A]: agent

[EX Q]: Add Mark and Louise please.
[EX A]:
user