Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Hi, I'm looking for a 1 star place to stay with free wifi. Sentence2: Well, I'd like to book one. I don't think it matters which one. Sentence3: You are welcome, goodbye. Sentence4: There are 5 guesthouses with 4 star ratings in Cambridge with moderate to cheap price ranges. Would you like more information? Sentence5: Alright. I wanted a 1 star, but I guess I can listen to the 2 star options. Sentence6: Okay, how many people will be in your party? Sentence7: Hmm. What do you what about 4 star hotels? Sentence8: No, that is all. Thank you. Bye. Sentence9: What dates would you like to book the room for? Sentence10: I have 2 on the north side that are in the moderate price range and 1 on the east side in the expensive range. Would you like to book one. Sentence11: I need it for two nights starting on Saturday. Sentence12: It would be for 7 people. Sentence13: I'm sorry there are no 1 star hotels with internet, would you like me to search on 2 stars, we have a few hotels available. Sentence14: I have booked you at the A and B Guest House at 124 tenison road. The reference number is 0J08KUGQ . Can I help you with anything else? Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System