You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: It is located in the centre. The postcode is cb23na. Sentence2: That will be all, thank you very much for your help! Sentence3: Sure, thank you! Will you please book a table for 4 people at 19:00 on Friday? Sentence4: Most of the nightclubs are in the centre area. Ballare is located at Heidelberg Gardens in Lion Yard. Would like to hear about some others? Sentence5: You have four options. Do you have an area preference? Sentence6: Booking was successful. The table will be reserved for 15 minutes. Reference number is : TLAT8P6I . What else can I do for you today? Sentence7: How about Charlie Chan? I eat there sometimes. Sentence8: Glad to have been of help. Thank you for using the Cambridge TownInfo centre. Have a great day. Sentence9: No, but could you tell me more about that one? is it in the centre? What's the postcode? Sentence10: I would like it to be in the centre. Sentence11: I'm also looking for a restaurant that serves cheap chinese food. Sentence12: I'm looking for a nightclub to visit. Question: Who has spoken the sentence 1? (A) User (B) System
A:
Answer: (B) System