You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: They are located at Parkside, Cambridge CB11JG. Sentence2: Hope you feel better. Sentence3: The Parkside Police Station is in Parkside, Cambridge. Is this close to your location? Sentence4: That is all now, thank you. Good bye. Sentence5: I was in a car accident. I need to contact the police, please. Sentence6: Thank you. That's all I need to know for now. Sentence7: Yes I'll need their address please. Sentence8: Do you need anything else? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User