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

Sentence1: Have a good day! Sentence2: yes, the nirala is indian restaurant in the moderate price range and in the north. It is located at 7 milton road chesterton and its phone number is 01223 360966. Is there anything else I can help you with? Sentence3: Is there anything else in the moderate price range on the north part of town? Sentence4: I would like a moderately priced restaurant in the north part of town Sentence5: Golden Wok is located in the north part of town and is the moderate price range. Their address is 191 Histon Road Chesterton. Sentence6: No, thank you. That's all I need. Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User