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

Example input: Sentence1:i need a place to dine in the center thats expensive Sentence2: I have several options for you; do you prefer African, Asian, or British food? Sentence3: Any sort of food would be fine, as long as it is a bit expensive. Could I get the phone number for your recommendation?Question: Who has spoken the sentence 2? (A) User (B) System
Example output: Answer: (A) User
Example explanation: The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system
Q: Sentence1: Yes a table for four please. Sentence2: Yes it is. Would you like a reservation there? Sentence3: Is it expensive? Sentence4: What is the address and postcode of the Backstreet Bistoro? Sentence5: I'm sorry the only mexican restaurant is located in the south. Sentence6: I have found one. The Chiquito Restaurant Bar is in the south side of town. Would you like me to make a reservation for you? Sentence7: They are located at 2 Sturton Street City Centre postal cb12qa, have I been able to resolve all of your questions today? Sentence8: We need a table for Tuesday at 12:30 please. Sentence9: Backstreet Bistro looks like a top choice, shall i book you for there? Sentence10: Thank you. Oh wait! It needs to be a table for 2. Sentence11: We have 4 options! Is there a price range you'd like to stay in? Sentence12: Thanks for all your help. That will be all for today. Goodbye. Sentence13: No problem. What day and time were you thinking? Sentence14: Have a great time. Sentence15: Actually, I was looking for a Mexican restaurant in the centre of town. Sentence16: I will go ahead and book that for you. Sentence17: What about a gastropub? Sentence18: I also want to find an attraction called Corpus Christi. Sentence19: i'm looking for a mexican restaurant Sentence20: Corpus Christi is a college in town centre. It is located at king's parade, postcode cb21rh. The entrance fee is 2 pounds. Do you need their phone number? Sentence21: Yes, I'm looking for a restaurant in the expensive price range in the city centre. Mexican is my first choice. If none is available, gastropub is fine. Sentence22: You are booked for Backstreet Bistro for 2 people. Your reference number is P4P2R28V . May I help with something else? Question: Who has spoken the sentence 13? (A) User (B) System
A:
Answer: (B) System