Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: Please book a taxi between All Saints Church and pizza express, I'd like to leave the church by 21:45. Sentence2: I'll think about it, thank you. Could you reccommend a few attractions in the same area of town? Sentence3: I need an italian place in the moderate price range to eat at. Sentence4: Yes, both Pizza Express locations are in the centre. Would you like more information? Sentence5: Choose one of them for me and let me know the phone number, address, and postcode please. Sentence6: Okay that's all I need for now. Thank you. Sentence7: OK, there are two Pizza Huts, two Pizza Expresses, and a Prezzo. Sentence8: We have 5 options available that meet that criteria. Is there a specific area you would like? Sentence9: In the centre are the All Saints Church postcode cb58bs, the entrance is free. Also, the Great Saint Mary's Church postcode cb23pq entrance fee 2 pounds. Sentence10: Great! Thank you for using our services! Sentence11: Okay your contact number is 07950726501 Your car is a grey bmw. Sentence12: Are any of those options located in the centre of town? Sentence13: Yes, I like you to tell me all 5 options,than I will decide! Sentence14: Sure, pizza express Regent Street City Centre cb21db, 01223324033. Would you like to book a table there? Question: Who has spoken the sentence 13? (A) User (B) System
A:
Answer: (B) System