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 found a guestgouse with a cheap price range. Would you like me to book it? Sentence2: I need to stay in the north, 0 stars. Sentence3: The City Centre North B&B is a cheap, 0-star guesthouse in the north. Would you like me to try booking a room there? Sentence4: I have the Archway House that is 4 stars. And is located in the north. Would you like me to try to book that? Sentence5: Unfortunately I could not book that for you. Would you like to try another hotel? Sentence6: Yes please find another hotel. Sentence7: I'm sorry, I misspoke a moment ago. I need a hotel in the cheap range if you can find one. Sentence8: Actually I would prefer a moderate hotel. Sentence9: Thank you for using our service today. Sentence10: I was able to book you for the Worth house which meets all of your criteria, your reference number is RJUMPPNC Sentence11: Yes, please. I need rooms for 3 nights for 4 people beginning Friday. Sentence12: Thank you for your help, that is everything that I need. Question: Who has spoken the sentence 5? (A) User (B) System
A:
Answer: (B) System