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

Sentence1: Yes, it's for 8 people. 16:45 on Monday. I would like the reference number, if it is available. Sentence2: Yes please try the Shiraz Restaurant. Sentence3: I'm looking for a place to eat. I would like it to be an expensive restaurant in the centre. Sentence4: That wasn't available. Shall I try the Shiraz Restaurant? Sentence5: I'm looking for a restaurant with mediterranean food. Sentence6: I have found two restaurants. One is La mimosa, and the other is Shiraz restaurant, would you like me to book one for you? Sentence7: You are welcome. Enjoy your stay in Cambridge. Sentence8: I found 33 expensive restaurants in the centre. What type of cuisine would you like? Sentence9: You've got a table for Monday at Shiraz Restaurant. Your reference number is NS7MCM5B . Can I help with anything else today? Sentence10: That will be all. Thank you very much. Sentence11: Can I please get the number of people dining,day,and time please. Sentence12: Please book the One is La mimosa Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System