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

[EX Q]: Sentence1: You're welcome, enjoy your day. Sentence2: How about Downing College? It has free admission and is located on Regent Street/ Sentence3: I'd like to visit a college in the center of town. Could you help me find something interesting? Sentence4: That sounds great! Can I have their phone number and postcode, please? Sentence5: No, that was all I needed to know. Thank you, you've been very helpful. Sentence6: Downing College's phone is 01223334860 and their postcode is cb21dq. Can I help you with anything else today? Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: I am sorry but you will have to get ticket there and here is the address 251a chesterton road. Sentence2: Do you want me to make a booking? Sentence3: I'm seeking an attraction! A boat one will be nice. Sentence4: Yes please! Thank you so much! Sentence5: Great! I have four for you. Two are in the centre. Any location you'd like in particular? Sentence6: Sure, I can get tickets for the cambridge punter in the city centre. If that sounds okay, what day and time would you like? Sentence7: I am also looking for the Oak Bistro, a place to eat. Sentence8: No, I'd like the name of one in the centre please. Question: Who has spoken the sentence 2? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: The reservation for 2 nights was successful. Your reference number is UKSVUD20 . Is there anything else I can help you with today? Sentence2: I certainly can. Do you have additional preferences? Sentence3: You're welcome! Enjoy your stay! Goodbye. Sentence4: Ok. The acorn guest house is in the north part of town in the moderate price range. Would that work? Sentence5: I'm looking for a guesthouse, and I misspoke earlier. I actually don't care about the internet, but I do need free parking. Sentence6: That's all, thank you . Sentence7: The area doesn't matter. Sentence8: Yes. I would like to book that for 4 people for 4 nights staring on Wednesday. Sentence9: Would you be able to help me find a room that has free wifi? Sentence10: Sorry, it was unavailable at that time. Perhaps you might want another day or a shorter stay? Sentence11: Can you get it for 2 nights? Sentence12: I have 21 guest houses, can you tell me what area you would like to be in? Question: Who has spoken the sentence 10? (A) User (B) System
[EX A]:
Answer: (A) User