You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: I'm sorry, but there aren't any reservations available at michaelhouse at that time. Would you like to try a different restaurant? Sentence2: I can recommend the Michaelhouse Cafe. Would you like me to make a reservation? Sentence3: Yes, I would like to reserve a table for 5 people at 18:00 on Wednesday. Sentence4: Yes, please find me another restaurant in the city center in the same price range. Sentence5: michaelhouse cafe is a nice place and the only option available. Sentence6: I am looking for a restaurant in the city center that serves modern European food. Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User