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

[EX Q]: Sentence1: Enjoy your day. Good bye. Sentence2: The address is colville road, cherry hinton. Sentence3: That is all I need, thank you. Sentence4: Sure, I can get you aboard a 15:21 arriving at 17:06. Would you like me to book a seat aboard TR9839? Sentence5: Sounds good. What is the postcode, please? Sentence6: You're welcome! Have a great day! Sentence7: Of course. The Cherry Hinton Village Centre has multiple sports in the east end of town. Sentence8: There are quite a few running all day to many different stations. Where would you like to go? Sentence9: I need a train leaving cambridge on thursday. Sentence10: I would like to go to Leicester and get there by 18:45 Sentence11: The postcode is cb19ej. Is there anything else I can help you with? Sentence12: Good bye. Sentence13: Thank you for using our service. have a good day! Sentence14: Oh wait! Before you go, can you give me some information on the cherry hinton village centre? Sentence15: Yes, may I have their address, please? Sentence16: Not right now. Thanks for the information though! Have a great day! Goodbye. Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Your booking was successful! Your reference number is EV4ADBI9 . Sentence2: I need it for Sunday. Sentence3: Yes. Let's book it. Sentence4: I would like it to be in the west. It doesn't matter if it has free parking or not. Thank you! Sentence5: There are four three star guest houses. Is there an area of town that interests you the most? Sentence6: Train TR3154 leaves cambridge at 13:06 and will arrive at peterborough at 13:56 on Monday. Would you like me to book a ticket? Sentence7: I am looking to stay at a guesthouse that has a 3 star rating. Sentence8: ok for how long and how many people please Sentence9: I want a train that goes to peterborough and leaves after 13:00 Sentence10: Does it leave on Monday? Sentence11: There is the hobsons house. Would you like me to book it? Sentence12: For 3 days and 2 people,I need a confirmation number too Sentence13: and what day do you need the reservation for? Sentence14: The next train is the TR0545 leaving cambridge at 13:06. Would you like me to book it or more information? Question: Who has spoken the sentence 12? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: enjoy your stay in cambridge! Sentence2: No thanks. I will book later on my own. Thanks for all the help. Goodbye. Sentence3: Would you like to stay in the East part of town, near the gallery? Sentence4: It is located at the belfast yard, coldham's road in the east of the town. Here's the phone number 01223902116 Sentence5: We have one guesthouse in the south. Bridge Guest House on 151 Hills Road. Would you like to reserve a room? Sentence6: Can you let me know the price range of the guesthouse? Sentence7: Certainly! The price range is moderate. Their phone number is 01223247942. Would you like me to book a room for you? Sentence8: No, I'd like a 3 star guesthouse in the south. Sentence9: Actually, a friend was telling me about this great gallery in town. It was called the Saint Barnabas Press Gallery. Can you tell me about it? Sentence10: I am excited to see some local attractions. Can you help me with a particular one? Sentence11: Sure. Were you looking for a particular area of town to visit? Sentence12: I am also looking for a place to stay at. Any recommendations? Question: Who has spoken the sentence 7? (A) User (B) System
[EX A]:
Answer: (B) System