You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: That narrows the selection to six. Would you like me to suggest one? Sentence2: No thank you thats all I need Sentence3: Yes, it's for a special occasion, so something expensive would be preferred. Sentence4: Can you please recommend one and book it for my party? Sentence5: I will need to know your departure and destination before reserving. Sentence6: There are 9 restaurants in the city centre that serve Indian food. Do you have a preference in price range? Sentence7: Yes, that is correct, 12:45 Tuesday for 6. Sentence8: Thanks, can you help me find a train to get there as well? Sentence9: Thanks for using our service, and goodbye! Sentence10: Please, if you can, find me a restaurant in the centre that serves Indian food Sentence11: There are six different restaurants in the area that can reserve you the table that you require. Your choices are Curry Garden, The Golden Curry, Saffron Brasserie, Panahar, Curry King, and Curry Queen. Which would you prefer? Sentence12: Great. Your table is reserved for 15 minutes and your reference number is WA0R6QZN . Sentence13: TR6971 Departs at 07:35 and arrives by 07:52. The duration of the ride is 17 minutes. Would you like me to book it for you? Sentence14: I would recommend curry garden. I just need to verify the time needed is 12:45 on Tuesday? Sentence15: We will need to depart from Ely and will need to arrive in Cambridge by 08:15. How long will it take to arrive and what will be the departure time? Sentence16: I need to book a table for 6 on Tuesday at 12:45. Can any of them do that? Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System