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

[EX Q]: Sentence1: The postcode is CB58BS. Can I help you find anything else? Sentence2: Can you tell me what their star rating is? Sentence3: I need something in the south and free parking. Sentence4: I will be in the centre of cambridge. I am looking for any type of attraction involving architecture. Sentence5: You're very welcome, I'm glad that I could help. I hope that you enjoy your stay! Goodbye. Sentence6: Of course! They are a 3-star establishment. Would you like me to go ahead and book that for you? Sentence7: thats it, thanks! Sentence8: Bridge Guest House was available for 2 nights. Your reference number is ULWMFZAX . What else can I do for you today? Sentence9: I'm sorry. There is no availability. Would you like to try different dates or another hotel? Sentence10: I'd recommend All Saints Church on Jesus Lane. Did you need help with anything else? Sentence11: I would recommend the Bridge Guest House based on your criteria. Would you like me to book you a room? Sentence12: There are 33 places to stay, do you have any requirements? Sentence13: How about just 2 nights instead? Sentence14: yes, 7 people 4 nights starting Wednesday. Sentence15: I need a place to stay. Sentence16: Can you give me the postcode for that? Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Yes. I will be staying 5 nights starting Friday. Sentence2: Im also looking for the cow pizza kitchen and bar. Whats the address for it? Sentence3: its address is Corn Exchange Street. what else can i do for you? Sentence4: Oh, expensive please. I do hope it is a guesthouse? Sentence5: You have helped me with everything I need. Thank you. Sentence6: Anytime. Enjoy your visit. Sentence7: I'll be staying for 5 nights. Sentence8: Unfortunately they are both hotels. Sentence9: Booking was successful. Reference number is : GQPN80PK . Is there anything else I can assist you with today? Sentence10: Okay I've got three options here. Would you like a cheap or an expensive price range? Sentence11: Can you help me locate a hotel to stay at that has free parking and a 4 star rating? Sentence12: Oh. I would really prefer a guesthouse. How about the moderate price range? Sentence13: Okay, I recommend The Acorn Guesthouse. Would you like me to book there? Sentence14: NO problem. How long are you staying? Sentence15: The location isn't important. I need to book it for Friday, please. Sentence16: They are moderate, it is a gastropub, in case you need them, the postal is cb23qf and the phone number is 01223308871, can I assist with anything else? Sentence17: I have 9 guesthouses in the moderate price range, do you have a location preference? Sentence18: I need it's price range please Question: Who has spoken the sentence 1? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: Churchill college is a college in the west. The phone number is 01223336233. The postcode is cb30ds. Can I help with anything else? Sentence2: Well what about helping me find something to visit in Cambridge? What is there to do on the west side? Sentence3: Yes. The guesthouse must include free parking and free wifi. Sentence4: You could always visit Churchill College. Sentence5: Oh dear. Can you try one more time? Moderate guest house, free wifi and parking, for 1 night, Friday, 4 people? I really need this room. Sentence6: Do you have any hotels with free wi-fi and parking in the moderate price range? Sentence7: I'm sorry, I have tried the Hobsons House and The acorn guest house for 3 nights. Could you possibly book a different day to check in? Sentence8: Could you help me find a moderately priced guesthouse? Sentence9: I'm sorry but the booking was unsuccessful. Would you like to book another day or for a shorter stay? Sentence10: You're welcome, please enjoy your visit to Cambridge. Sentence11: Lovell lodge does not have availability on Friday either. Would you like to try another guesthouse? Does the area matter? We could try kirkwood house, it is in the north. Sentence12: I'm sorry, but it's not available. Sentence13: Could you tell me if it is available for one night? Sentence14: I am sorry but the Carolina Bed and Breakfast is not available for one night either, may I check another guesthouse for you? Sentence15: I apologize for the trouble earlier. I managed to find you a guesthouse called The Hamilton Lodge and made a successful reservation. The reference number is EL0WI0ZV . Sentence16: Yes it will. Please book it for 4 people staying 3 night starting on Friday. Sentence17: I found 15 do you have any other requirements to help narrow it down? Sentence18: Sorry, I tried all 12 of the avaialble places with those requirements and there is no availability. Sentence19: Are there any other hotels available? Sentence20: That would be fine with me Sentence21: Yes. i have the Ashley North and the Lovell Lodge. Do you have a preference? Sentence22: Carolina bed and breakfast has free parking and internet. It is located in the east with a moderate price range. Will this suit your needs? Sentence23: Oh, thank goodness. I was getting worried. Can you recommend any fun things to do in the west side of town? Sentence24: No, that's all I need today. You have been very helpful. Thanks! Sentence25: Yes, please find another moderate guesthouse with free parking and wifi to book. Sentence26: Okay, what kind of attraction is that? May I have their postcode and phone number please? Sentence27: How about we try the Lovell Lodge, if that's okay? Sentence28: Hmmm ... let's try booking the Acorn Guesthouse for 1 night? 4 people, arriving Friday. Question: Who has spoken the sentence 25? (A) User (B) System
[EX A]:
Answer: (B) System