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

Sentence1: Let's try the Peking Restaurant, can you make a reservation for us on Monday? Around 13:45 please. Sentence2: There is the Wandlebury Country park. Phone 01223243830. Would you like anything else? Sentence3: Perhaps you could locate a park in the south? Sentence4: Yes. I'm looking for something to do while I'm in town. Sentence5: No that is all I need for today. Sentence6: There are museums, architecture, colleges, theater, cinema, boat tour. Doers anything interest you in particular. Sentence7: Your options are the Good Luck Chinese Food Takeaway, or Peking Restaurant. Sentence8: in the same area as the restaurant? I am interested in architecture please Sentence9: Okay, I've got that taken care of. Your reference number is ECBRMJS2 . Can I help you with anything else? Sentence10: There is no architecture in the south of town Sentence11: Yes certainly but how many people will be dining please? Sentence12: okay sounds good. Sentence13: It appears that they do not have tours. It is a free admission, so you can feel free to go when you please. Can I help with anything else? Sentence14: Could you call and find out what hours they open and close? Also, if they have tours? Sentence15: Okay! What type of cuisine do you want? Chinese, Indian, Italian, and Mexican cuisines are available. Sentence16: I would like a restaurant in the south in the expensive range. Sentence17: It will be 6 people dining. Sentence18: I would like a Chinese restaurant. Question: Who has spoken the sentence 17? (A) User (B) System
Answer: (B) System