Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: I need the train to arrive by 11:15. Sentence2: If you can't find a guesthouse, could you look for a hotel? Sentence3: i would prefer the south. are there any in that area? Sentence4: I don't have anything in the expensive range that fits that criteria. Sentence5: There is a variety of guesthouses to choose from. How much would you like to spend? We have cheap, moderate, and expensive. Sentence6: The train departs at 09:50. Sentence7: I don't know where I am staying. I'm looking for a guesthouse and I thought you could help. Sentence8: please book it for 3 people and 5 nights starting from Thursday. Make sure you get the reference number Sentence9: The TR3246 arrives at 10:07, would you like to book that train? Sentence10: There is one expensive hotel in the south -- The Lensfield Hotel. It is a 3-star hotel. Would you like to book a room? Sentence11: Certainly. It looks like the trip is 17 minutes long. When would you like to leave? Sentence12: There are 5 available hotels. What area were you looking to stay? Sentence13: The Lensfield Hotel will be expecting the 3 of you to arrive on Thursday and to stay for 5 nights. Your Reference number is : VOGVC4RY . Sentence14: Thank you for using the Cambridge TownInfo centre. Goodbye. Sentence15: Great, that's all I need, thanks so much for your help! Have a great day! Sentence16: Great. I'm not ready to book today though. I am also looking for a place to stay. Sentence17: where are you staying and for how long and how many rooms please Sentence18: When does that train depart? Sentence19: I would like the expensive price range. Sentence20: I am leaving Tuesday and need to take a train from Cambridge to Ely Question: Who has spoken the sentence 13? (A) User (B) System
A:
Answer: (B) System