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

Sentence1: Perfect, thank you very much for your help Sentence2: thank you for using our system, enjoy. Sentence3: I'm looking for British food. I want the restaurant to be in the town centre. Sentence4: No, I look forward to dining at the Copper Kettle. Thank you. Goodbye. Sentence5: Welcome. Anything else I can help you with? Sentence6: It doesn't matter. Please give me the phone number to the restaurant you choose. Sentence7: How about The Copper Kettle? The phone number is 01223365068. Sentence8: Sure, there are quite a few British restaurants in the centre. Would you prefer something expensive or moderately priced? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User