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: The Acorn Guest House is moderately priced and 4 stars. Would you like to book there? Sentence2: I do not prefer a particular area of town but I would like the hotel to be a guesthouse. Sentence3: I need to book a room for two nights please. Sentence4: I do not care about the price range Sentence5: I am also looking for a hotel in town. I would need free parking and free wifi. Sentence6: In order to book your room I will need to know the dates you will be staying and the number of guests. Sentence7: I want to try a local restaurant called Jinling noodle bar, can you help? Sentence8: Your taxi has been booked and it is a red honda and its contact number is 07876946762. . Sentence9: That sounds great. Yes please! Sentence10: No thank you, but can you make a booking for 2 people at 17:30 on wednesday? Sentence11: I would like the booking starting on Wednesday for 2 people please. Sentence12: Thank you! I also need to get a taxi to get me to the restaurant by 17:30. Sentence13: There are 21 accommodations that meet your criteria. Is there a particular price range you prefer? Sentence14: Thank you for using the Cambridge TownInfo centre. Have a great day! Sentence15: I have made a booking for you for two nights. Your reference number is 1H5BM0PN . Is there anything else I can help you with? Sentence16: And how many days would you like to stay? Sentence17: Absolutely! The address of the restaurant is 11 Peas Hill City Centre, and their telephone number is 01223566188. Would you like me to help you find a taxi there? Sentence18: Alright, your table has been booked at the Jinling Noodle Bar for Wednesday at 17:30 for 2 people. Your reference number is VJ15Q075 . Is there anything else I can do? Sentence19: Thank you for your help. Good Bye! Sentence20: Do you have an area of town you prefer? Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System