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: The postcode is CB11JG. Can I help you with anything else? Sentence2: Hello, I need information for the nearest police station please. Sentence3: You are welcome. Please let us know if there's anything else we can assist you with in the future. Sentence4: No, thank you for your help. Sentence5: The telephone is 01223358966 and the address is Parkside, Cambridge. Is there anything else I can help you with? Sentence6: Can I have the postcode please? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User