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

Sentence1: I have found two that may work. first, la margherita is at 15 Magdalene Street City Centre, phone is 01223 315232. second one serves vietnamese at 17 Magdalene Street City Centre, number is 01223 362456 Sentence2: Thank you very much for using the Cambridge Restaurant system. Sentence3: No thank you. Sentence4: Those are the only listings in the west part of town. Would you like to change your location or price range? Sentence5: Is there anything else I can help you with? Sentence6: No, that's fine. Thank you! Sentence7: I want a cheap restaurant in the west part of town. what is the address and phone number? Sentence8: Is there anything else, if so give me their address and phone number. Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System