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

[Q]: 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
[A]: Answer: (B) System


[Q]: Sentence1: How about the Gonville Hotel located in the centre area of town? Sentence2: Between $100-$300 per night. Sentence3: I have several available. What is your price range? Sentence4: Ok, I have several hotels. Any particular location? Sentence5: Location doesn't really matter as long as there's free parking available. Sentence6: What is their postcode? Sentence7: I need a place to stay with free wifi. Sentence8: Their postcode is cb11Iy, address gonville place, phone 0122336661 they have wifi and free parking too. Would you like me to book this for you? Question: Who has spoken the sentence 4? (A) User (B) System
[A]: Answer: (A) User


[Q]: Sentence1: I need to be in cambridge by 21:45. Could you find me close to that time? Sentence2: I'm looking for a place to stay in the north. Sentence3: Yes. I need a train from Ely to Cambridge. Sentence4: The trains departs from Ely every two hours at 5:52, 7:52 so on. What time do you plan to travel? Sentence5: I would like to leave on Tuesday please, can I have the price and depature times also? Sentence6: No, I am sorry another day perhaps or a shorter stay might be able to get that booked for you. Sentence7: Your best bet would be TR1537 which arrives in Cambridge at 19:52. The price is 4.40 pounds per ticket and the departure time is 19:35. Sentence8: Acorn guest house is in the north, would that work for you? Sentence9: Booking was successful. Your reference number is NTQSJSP0 . Do you need further assistance today? Sentence10: Yes if it has free parking, meals, pool and wifi. I want it to be in the expensive price range. Sentence11: Thank you! Please feel free to contact us if you change your mind or need further assistance! Have a great day! Sentence12: Can we try it for 1 night? Sentence13: And which day would you like to leave on? Sentence14: How about Ashley Hotel in the north part of town? It's on Chesterton Road. Sentence15: I am looking for a hotel in the north part of town with free parking, a 2 star rating, and in the moderate price range. Sentence16: Sounds good. Can you book it for four nights starting on Tuesday? Sentence17: That is all I need. Thank you. Sentence18: I'm sorry, there are no expensive hotels in the north area. Acorn Guest House is moderately priced, and does have free parking and wifi. Would you be interested? Question: Who has spoken the sentence 15? (A) User (B) System
[A]:
Answer: (B) System