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

Sentence1: How about the Alexander bed and breakfast in the centre? It is a cheap 4 star guesthouse with free internet and wifi. Sentence2: That sounds like it might work. Could you check availability for two people this weekend? Sentence3: Does this place include free parking? Sentence4: I am unsure at this time. Sentence5: I am glad to help. Have a nice day. Bye. Sentence6: I live in the centre of town and want to see if I can find a reasonable room for my parents to stay while they are visiting. Sentence7: Okay, would you like some more information about that hotel? Sentence8: You have been very helpful. I have everything I need, thanks. Bye Sentence9: The address is 56 saint barnabas road. Sentence10: What day are they arriving, and how many nights are they staying? Sentence11: The alexander bed and breakfast is a cheap, 4 star guesthouse in the centre area, It has wifi and parking. Does this fit your needs? Sentence12: Can you tell me what the address is? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User

Sentence1: Which one includes free parking? I don't need internet included. Sentence2: Does Finches Bed and Breakfast have free wifi? Since they both have free parking, I might as well go with the cheaper price. Sentence3: Both of them have free parking. Sentence4: Certainly! What time of day would you like to travel, and what are your departure and arrival locations? Sentence5: Good news! Booking was successful. Reference number is : G3504UR7 . Sentence6: Yes that would be perfect! Can I please get it for 3 people, 4 nights and We'll be there by Wednesday Sentence7: That train leaves at 11:11. Travel time is 47 minutes. Sentence8: There are two guesthouses on the west side: Finches Bed and Breakfast, with a cheap price point, and Hobsons House, with a moderate price point. Would you be interested in either of these? Sentence9: Thank you very much for your help. Sentence10: No, I just need the departure time. How long of a trip is it? Sentence11: I need to book a guesthouse in the west of cambridge, are there any? Sentence12: Yes, they have internet as well. Would you like to book this room for you? Sentence13: If you need help with anything else, please don't hesitate to contact us. Enjoy your travels. Sentence14: Will be leaving Cambridge & going to Kings Lynn. Wanted to arrive by 12:00. Sentence15: Sure, TR8704 arrives at 11:58, can I book a seat for you? Sentence16: Fantastic, I'd also like a train leaving on Sunday, please. Question: Who has spoken the sentence 12? (A) User (B) System
Answer: (A) User

Sentence1: No, there is nothing further. Thank you so much for your help! Sentence2: I would like to find a train to Kings Lynn. Sentence3: I am looking for information in Cambridge Sentence4: How about train 3112? It leaves Cambridge at 05:11 and arrives in Kings Lynn at 05:58. Sentence5: Okay! What would you like to know? Sentence6: Try some of our great restaurants during your stay. Goodbye. Sentence7: Thank you. Could you recommend a college to visit? Sentence8: When would you like to travel to Kings Lynn? Sentence9: Thank you. How much would it cost? Sentence10: 01223334900. That is in the Centre. Is there anything else? Sentence11: You are so welcome! Have a great time! Sentence12: On Friday, and I want to arrive by 19:15. Sentence13: It will cost 9.80 pounds per ticket. Sentence14: Perfect. Could you tell me their phone number and area? Sentence15: Thank you, I will. Sentence16: how about christ's college? Question: Who has spoken the sentence 7? (A) User (B) System

Answer: (B) System