Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Do you need any further assistance? Sentence2: You're welcome. Take care and call us again. Goodbye. Sentence3: i had car accident dispute and am looking for help Sentence4: Sure! I think you'll need the police. Their contact number is 01223358966. Sentence5: Great, do you have the address and postcode? Sentence6: Thanks, I'm going to call right now. Goodbye. Sentence7: The address is Parkside, Cambridge, postcode CB11JG. Sentence8: No. Thank you so much for all of your help! Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User