Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: I have you booked at acorn guest house. Reference number is: IDAIIS1T . Sentence2: Brilliant! Thank you. Sentence3: You are very welcome, thank you and have a nice stay. Sentence4: There are quite a lot of them in that area. Do you have a price range in mind, or a particular star rating you'd like me to look for? Sentence5: I would prefer the north side of town please. Sentence6: I found 21 results. What side of town would you like? Sentence7: Would you try 1 night for 6 people on Sunday, please? Sentence8: No, you have been most helpful. Thanks, again. Sentence9: Unfortunately, booking within your criteria was unsuccessful at all hotels. Could you change your number of days? Sentence10: Not really. I just need a hotel that can accommodate 6 people for 5 nights, starting Sunday. Sentence11: Hi, can you help me find a guesthouse? I need free parking. Sentence12: Is there anything else I can help you with today? Question: Who has spoken the sentence 5? (A) User (B) System
A:
Answer: (B) System