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

Sentence1: Thanks! I'm all set now. Bye! Sentence2: i am looking for a place to stay. The hotel should have a star of 4 and should include free wifi. Sentence3: I have several, when is your stay? Sentence4: A white bmw is booked for you. The contact number is 07793421858 Sentence5: There are 21 options. What type of food do you like? Our restaurants are quite diverse. Sentence6: a and b guest house is very nice Sentence7: Okay, now I would like to find a restaurant in the centre that is also in the moderate price range Sentence8: Yes it is in the moderate price range, what help can I help with? Sentence9: Ah, it was just a temporary lapse, it is back up now. I have you booked. The reference number is K9PYGG5A . Sentence10: Booking was successful. Reference number is : ZCRPOLK8 . anything else? Sentence11: Yes! What do you mean it's down? I need a place to eat! Sentence12: Choose one and surprise me. And book it for 6 people on thursday at 13:15. I'll need the reference number Sentence13: I'll need it to pick me up from the hotel and arrive at the restaurant at least 10 min before our reservation? Sentence14: You are welcome and good bye Sentence15: What is the name of the restaurant you booked the reservation at? We will also need a taxi to get there from the guesthouse. Sentence16: It was restaurant one seven, what time would you like that taxi? Sentence17: Can you confirm a and b guest house is in the moderate price range, please? Sentence18: It appears our booking system is down. Is there anything else I can do for you? Sentence19: book for 6 people and three nights starting on thursday. Sentence20: Do you have one that is a guesthouse? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User

Sentence1: Booking was successful for the bridge guest house. Your Reference number is : LBEOV690 . Sentence2: Yes please. Which is the cheapest? Sentence3: Thank you. Have a nice day. Sentence4: No. I would like to make a reservation for Wednesday for 3 nights and 8 people. I will also require a reference number. Sentence5: I was unable to book your stay at any of the three hotels. Would you like to change the length of your stay or change the day? Sentence6: There are 2 hotels with a 3 star rating and free parking. Would you like to stay in the centre or south? Sentence7: Sorry, I was mistaken. There are 3 guesthouses matching your request. One each in the south, north, and west. Would you like to book one? Sentence8: Thank you. Have a nice day. Sentence9: Can you please try a 2 day stay. Sentence10: I can only tell you they are all in the moderate price range. Do you have any other preferences? Sentence11: I am looking for a hotel with a 3 star rating and free parking Sentence12: Either is fine. I'd like a guesthouse. Question: Who has spoken the sentence 5? (A) User (B) System
Answer: (B) System

Sentence1: I'm afraid there aren't any scottish places in town. Would you like to try a different cuisine? Sentence2: i have 2 places that serve french food and are expensive. one is restaurant two two. the other is cote. which would you like? Sentence3: Does that also have free parking? And I forgot to mention I'd prefer a guesthouse. Sentence4: Sure, the Cambridge Belfry fits that bill. It has great reviews and is cheap. Can I get more information for you? Sentence5: Book for me 1 person and 2 nights starting from wednesday. Sentence6: I have made the reservations and your reference number is 4WK86HPM . Sentence7: thanks alot. have a good day Sentence8: Is there a French restaurant? Sentence9: You're welcome! Have a great day as well. Sentence10: I'll book a table for Cote. 1 person at 16:15 on the same day as the hotel booking. Sentence11: In that case, the Cambridge Belfry would not work. It's a hotel, not a guesthouse. The Acorn Guesthouse has wifi, parking, is moderately priced and has 4 stars. Sentence12: Your booking was successful.Your reference number is : 6UPHIRT7 . Is there anything else you need help with today? Sentence13: Hi, yes, I'm looking for a 4 star hotel to stay in. The only amenity it has to have is free wifi. Sentence14: Yes I am looking for someplace to eat that serves Scottish food that is in the expensive price range. Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System