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

Sentence1: Are they all listed as expensive? Sentence2: Could you please give me the phone number for the Royal Standard? Sentence3: I was really hoping for Sri Lankan. Sentence4: Sure, it's 01223247877. Sentence5: I'm sorry but I have nothing listed. Is there another type of food you might be interested in? Sentence6: I am looking for a restaurant in the expensive price range. It should serve Sri Lankan food. Sentence7: I found three located in the centre and one on the east. Which would you prefer? Sentence8: Okay, thanks. That will do it for today. Sentence9: Yes, they are all expensive. backstreet bistro is in the centre area, and royal standard is in the east. Would you like me to make a reservation at either of these? Sentence10: I'm afraid there aren't any Sri Lankan restaurants in town at all. Is there something else I can search for you? Sentence11: You are most welcome. Thank you for calling Cambridge TownInfo Centre. Goodbye. Sentence12: How about gastropub? Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System