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

[Q]: Sentence1: No, but I would like to find a cheap priced south african restaurant. Sentence2: I'm sorry, but we don't have and South African restaurants in the area. Is there a different type of food I can help you find? Sentence3: I would say let's look for an attraction first. Can you recommend something to do in the south part of town? Sentence4: I will go with whatever you recommend, I just need the attraction type and postcode. Sentence5: Hi, I am looking forward to trying some of your local restaurants. I do need help with some other places to go in town while I am there though. Sentence6: There are several nice parks in the area as well as theaters and museums. Sentence7: The byard art museum postal code is cb21sj. Can i help you get transportation to and from the museum? Sentence8: Try Portuguese then. Sentence9: Thanks so much for putting up with me! You've been great! Sentence10: 3 people will be dining. Please give me a reference number once you finish the reservation Sentence11: I would rather be in the south area. Sentence12: What is your food type preference? Sentence13: There are two results. Both are cheap. Do you prefer the south or centre? Sentence14: I have finished booking it for Thursday at 12:15 for 3 people at Nando, your reference number is TDQZGM38 . Do you need anything else? Sentence15: Can you book a table for me there on Thursday at 12:15? Sentence16: The only option is nandos. Sentence17: You are welcome enjoy Sentence18: How many people are in your party? Question: Who has spoken the sentence 15? (A) User (B) System
[A]: Answer: (B) System


[Q]: Sentence1: Can you book me 6 seats on that train? Sentence2: Hello, trains depart every 2 hours on the :21's, what day are you hoping to travel? Sentence3: I want to leave on sunday from Cambridge. Sentence4: There are 5 such trains. Do you have a preferred arrival time? Sentence5: You're still not done! Give me the train ID for the train. Sentence6: Sounds good to me. Book it for six people at 10:30 on Sunday. Out of curiousity... how long is that train trip going to take? Sentence7: Ok, the 15:21 going to Stevange on sunday would be great. I'll need the price and train ID as well please. Sentence8: The 15:21 train to Stevenage will take approximately 49 minutes to reach its destination. Is there anything else i can help you with? Sentence9: The prices is 10.24 pounds and the trainID is TR4550. Would you like me to book that for you? Sentence10: Great - I do still need to know the travel time for that train, though. The 15:21 train to stevenage? Sentence11: Yes, can you also let me know the price for that train? Sentence12: I would like to arrive in time for lunch, preferably around 11:00 Sentence13: Thank you for reminding me, your train ID Number will be: TR4550. Sentence14: I want to try food in Cambridge and need to get a train to stevenage that leaves after 14:45. Sentence15: The price is 10.24 pounds. Sentence16: There are 110 restaurants to choose from. What area are you looking to dine in, and what kind of food are you hungry for? Sentence17: Sorry, there aren't any expensive welsh restaurants, but there's an indian place named curry garden. Sentence18: I don't have any for that time frame, every train is running after 12:00. I can book you for one that leaves at 15:21. Is that alright? Sentence19: Find expensive welsh food, or if not welsh, indian, for 6 people at 10:30 Sunday. I need a reference number, please. Sentence20: Your total for 6 tickets is 61.44 GBP, payable at the station, for reference number T0KZHAA5 . Sentence21: Booking was successful. The table will be reserved for 15 minutes Reference number is : MUEIRYK2 . And the train will arrive at 16:10. Sentence22: Not quite yet, could you tell me what the travel time is for that trip? I also am looking for a restaurant to dine at. Question: Who has spoken the sentence 6? (A) User (B) System
[A]: Answer: (A) User


[Q]: Sentence1: Can you just book it for me? Table for 1 on Friday at 13:15. If you can, I would like the reference number. Sentence2: A free museum is a great choice. What is the address so I can go right away? Sentence3: None, what is one that you would recommend? Sentence4: I'd also like to find an expensive Indian restaurant. Sentence5: Yes, what is the attraction type for the museum of classical archaeology? Then, I will have another topic for you. Sentence6: I'm so bored! Can you find me something to do on the west end of the city, please? Sentence7: Yeah, how about 12:15? Sentence8: Unfortunately, booking was not successful. May I try another day or time slot? Sentence9: We've got 13 attractions in that area 5 colleges, 1 entertainment center and seven museum. Do you have a preference? Sentence10: I've found curry garden, would you like their information? Sentence11: i was unable to book at that time too, can we try some different time please Sentence12: The Museum of Classical Archaeology is located on sidgwick avenue in postcode cb39da. Can I help you with anything else? Sentence13: It is a museum located in the west. They are located on Sidgwick Avenue. What else can I help you with today? Sentence14: I find the museum of classical archaeology fascinating. It's also free! Would you like any more information on it? Question: Who has spoken the sentence 4? (A) User (B) System
[A]:
Answer: (A) User