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

Sentence1: Have a nice day! Goodbye. Sentence2: I am looking for an expensive restaurant that serves Welsh food. Sentence3: Thank you, goodbye. Sentence4: I apologize, there are no restaurants in the expensive price range that serve Welsh food. Would you like a different type of food? Sentence5: How about korean food? Sentence6: Little Seoul is an expensive Korean restaurant. Is there anything else I can help you with? Sentence7: Little Seoul is located in the centre of town and the address is 108 Regent Street City Centre. Sentence8: Yes, I would like their address and what part of town they are located in. Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User