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

Sentence1: I don't have a price range in mind. Can you recommend just one restaurant matching my criteria? Sentence2: I am starving! Sentence3: That sounds great. Can you just give me the postcode? Sentence4: Wonderful. That's all I need! Sentence5: Kohinoor is a cheap restaurant. Sentence6: There are a few of those. What price point are you looking for? Sentence7: One more thing, what's the price range? Sentence8: Great. Have a wonderful evening! Sentence9: The postcode for Kohinoor is cb12as. Is there anything else I can help you with today? Sentence10: What would you like to eat? Sentence11: Indian food in the centre, please. Sentence12: How about Kohinoor? It's a cheap Indian restaurant in the center. Would you like a reservation? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User