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

Sentence1: That sounds good, I have a group of seven and we want to eat at 20:00 on Friday. Sentence2: I want one in the certre area and in the moderate price range. Sentence3: Thank you goodbye. Sentence4: Unfortunately I wasn't able to get the reservation for you. Would you like me to try somewhere else? Sentence5: I've heard good things about Riverside Brasserie, they serve Modern European cuisine. Would you like to see if they have tables available? Sentence6: I have found some restaurants. They serve asian oriental, british, chinese, european, gastropub, international, italian, lebanese, modern european, spanish, and turkish. Sentence7: Can you help me find a restaurant please? Sentence8: Good news! Booking was successful. The table will be reserved for 15 minutes. Reference number is : ZXIRY17R . Sentence9: Thanks for all your help. Good bye. Sentence10: That would work, please book that. Sentence11: I don't care what type of food they serve. What would you recommend? Sentence12: What about the Copper Kettle? They serve British cuisine. Sentence13: Certainly, to narrow it down, do you have a preference for what part of the city it is in or what type of food is served? Sentence14: Can you recommend another moderately priced restaurant located in the centre? Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System