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

[Q]: Sentence1: If you can go ahead and recommend one and provide me with the phone number and address please. Thanks so much. Sentence2: I would like to book a train to Leicester that leaves on Saturday. Sentence3: That's all for today. Thank you for your help! Sentence4: Would you like to book a seat on TR1832? It will leave at 15:21 and arrive at 17:06, 105 minutes later. It will cost 30.24 pounds. Sentence5: sure, there are several in that area. including art galleries and history museums. Sentence6: Yes, do you have a certain time you'd like to leave or arrive by? Sentence7: broughton house gallery is located at 98 King Street and their phone number is 01223314960. Do you need anything else? Sentence8: Thank you for calling today. Sentence9: I'd like to leave after 15:15 please. Sentence10: In the centre, please Sentence11: Booking was successful, the total fee is 30.24 GBP payable at the station. Your reference number is VHWYUF80 Sentence12: What area are you interested in? Sentence13: i also want to check out some museums while i'm in town. Sentence14: Yes, can you please book that for me and send me a reference number. Thank you Question: Who has spoken the sentence 12? (A) User (B) System
[A]: Answer: (A) User

[Q]: Sentence1: I have two restaurants that meet your needs, Graffiti and Travellers Rest. Would you like to make a reservation at one of those? Sentence2: Yes, I need to book a table for five people at 17:15 for this Thursday. Sentence3: Thank you so much. Have a nice day. Bye. Sentence4: A reservation at 16:15 was successful at Graffiti. Your reference number is VCCP7L4M . Is there anything else I can help you with today? Sentence5: You're welcome, have a good meal. Sentence6: Will you check 16:15? Sentence7: Are there any expensive British restaurants in town? Sentence8: There are 57 restaurants that match your specifications. Do you want anything more specific? Sentence9: Yes, I'd like to find one in the west side of town. Sentence10: I am unable to book a restaurant at that time on Thursday. Is there another day or time slot I can check for you? Question: Who has spoken the sentence 5? (A) User (B) System
[A]: Answer: (B) System

[Q]: Sentence1: I could certainly help you book one if you don't mind that it has internet. Would you like to try the Acorn Guest House? Sentence2: Would you like to book one of those today? Sentence3: I have a train that departs at 21:01 and two more each a hour later than the first. Which train would you like to book? Sentence4: You're welcome. Have a nice day. Sentence5: There are 133 trains making that trip, do you have a day and time you would like to go? Sentence6: Yeah, could you find me a train? I'm in Cambridge, and I'd like to go over to Birmingham New Street. Sentence7: No that sounds perfect. Thank you for all your help. Sentence8: I have 12 guesthouse and 2 hotels in that range. Is there a certain area of town you would like to stay in? Sentence9: No preference on area, but can you see if there are any that have 4 stars? Sentence10: That sounds perfect. Can I have the postcode and phone number please? Sentence11: Okay, let's try that one. Sentence12: Yes, I'd like to leave after 21:00 on Wednesday. Sentence13: I have successfully booked you for the TR7935 train leaving at 21:01. Your reference number is E9ZIOMAN . Sentence14: Great, thank you! I'd like to find a place to stay, too. I'm thinking of something in the moderate range with free parking. Any ideas? Sentence15: Yes, it has 4 stars and includes free parking. Sentence16: I have 3 in the north, 1 in the south, and 1 in the east. Sentence17: Does it have four stars? Sentence18: It looks like all 9 choices do include Internet. Would you be willing to use one of those? Sentence19: I will take the 21:01. the ticket is just for me and I would like a reference number after the booking is completed. Sentence20: What day would you like to book the hotel for? Sentence21: I'll take whichever one doesn't include Internet. Sentence22: Sure, the postcode is cb41da and the phone number is 01223353888. Can I help with anything else today? Question: Who has spoken the sentence 15? (A) User (B) System
[A]:
Answer: (B) System