You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: I will take the 5:21. Can you please give me the travel time, train ID, and price? Sentence2: All of them are in the Centre. Two are in the cheap price range and two are expensive. Would any of those suit? Sentence3: I will need something with free wifi and parking Sentence4: Thank you for being so informative. I have two trains available. Both will get you there before 08:15. One leaves at 05:21 and the other at 07:71. Which do you prefer? Sentence5: Are they in the east or centre? Sentence6: The travel time of the 5:21 is 49 minutes, arriving at 6:10. Train ID is TR2515 and the price is 12.80 pounds. How many tickets? Sentence7: Yes, the Alexander offers those. El Shaddai, Gonville Hotel, or the University Arms Hotel all do as well, if those sound more appealing. Can I book you a room? Sentence8: Glad I could help. Have a good day. Sentence9: Yes, I also need to find a train from cambridge to stevenage on Friday. I need to arrive by 08:15. Sentence10: There are 4 choices for you to choose from. May I recommend the Alexander Bed and Breakfast? Sentence11: I'm looking for lodgings offering free wifi and free parking. Sentence12: 138 perne road is the address. Is there anything else I could help you with? Sentence13: I really wanted a hotel in the moderate price range. Can you look in the east please? Sentence14: Certainly, which part of town would you prefer to stay in? Sentence15: I have 2 options here. Shall I book you for carolina bed and breakfast? Sentence16: Sure, could I get the address please? Sentence17: The centre, please. Sentence18: I don't want to book at this time, just the information. So that's all thanks! Question: Who has spoken the sentence 9? (A) User (B) System
A:
Answer: (B) System