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

[EX Q]: Sentence1: Unfortunately, I am not seeing any 4 star hotels that are moderately priced in the centre. We could try a cheaper hotel or a guesthouse? Sentence2: Sure do. Their address is fulbourn, postcode cb15dh. Phone number is 01223295264, and entrance is free. It's a museum on the Eastside. Sentence3: Nevermind. Do you have info on gallery at twelve a high street. Sentence4: Thank you very much for your help, have a nice day. Sentence5: Thank you, enjoy your stay in cambridge. Sentence6: Of course. We have so many attractions! What part of town will you be in? Sentence7: I will be visiting Cambridge soon and can't wait to see some of your local attractions. I do need your help with some information. Sentence8: I'm sorry, but there are no cheap hotels in the center of town, either. The only cheap hotel is on the west side. Sentence9: How about in the cheap price range? Sentence10: I have two options. Would you prefer a hotel or a guesthouse? Sentence11: I need a 4 star room in the centre please. Sentence12: A hotel in the moderate price range. Thank you! Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Thank you. I am also looking for a particular restaurant, it is called Charlie Chan. Can you provide me its address? Sentence2: I want able to book your room at the Gonville Hotel for you for the two nights. Your reference number for this is KYXT8TUS . Sentence3: I would like to book for four people for three nights beginning on Tuesday. Sentence4: No, thank you. That's all I needed today. Sentence5: Does the Gonville Hotel have guesthouse accommodations? Sentence6: Yes please book it for four people in 3 nights starting on Tuesday Sentence7: Before I book this hotel I just want to inform you that I have confirmed that it is not a guesthouse but a hotel. Would you still like me to book? Sentence8: No how about two nights? Sentence9: I believe so, yes. Sentence10: Unfortunately it can not be booked for 3 days. Did you want to get information about a different hotel instead? Sentence11: I am looking for a 3 star hotel with free parking in Cambridge. Sentence12: Absolutely. On what day, for how many people and how long is your stay? Sentence13: Certainly! The address for the Charlie Chan is Regent Street City Centre. Would you like me to book a reservation? Sentence14: Thanks for contacting Cambridge TownInfo centre. Let us know if you need anything else and have a great day! Sentence15: I found a handful of locations that might suit your interests. Would you care to check out the Gonville Hotel? It has everything you are looking for in accommodations. Sentence16: Can you book this hotel? Question: Who has spoken the sentence 5? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: I have 10 cheap hotels available. Which area of town are you looking to stay in? Sentence2: I have finches bed and breakfast or the cambridge belfry. Would you like to book a room at one of them? Sentence3: I need a cheap hotel in Cambridge. Sentence4: Ok I will book it for you Sentence5: Yes it does. Would you like me to book it for you now? Sentence6: I would like to stay in the west area. Sentence7: Does it have free wifi? Sentence8: Yes please. I need it for one person on Saturday. A 3 night stay. Question: Who has spoken the sentence 3? (A) User (B) System
[EX A]:
Answer: (B) System