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".

[Q]: Here is the contact information for Antoine Toustou:
[A]: agent


[Q]: what is my first event in summer?
[A]: user


[Q]: Put on my calendar an item called Sell Stuff Online starting on Friday at 9 am and lasting for 6 hours, and mark me as out of office during that time
[A]:
user