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

[Q]: Sentence1: How about the Alexander bed and breakfast in the centre? It is a cheap 4 star guesthouse with free internet and wifi. Sentence2: That sounds like it might work. Could you check availability for two people this weekend? Sentence3: Does this place include free parking? Sentence4: I am unsure at this time. Sentence5: I am glad to help. Have a nice day. Bye. Sentence6: I live in the centre of town and want to see if I can find a reasonable room for my parents to stay while they are visiting. Sentence7: Okay, would you like some more information about that hotel? Sentence8: You have been very helpful. I have everything I need, thanks. Bye Sentence9: The address is 56 saint barnabas road. Sentence10: What day are they arriving, and how many nights are they staying? Sentence11: The alexander bed and breakfast is a cheap, 4 star guesthouse in the centre area, It has wifi and parking. Does this fit your needs? Sentence12: Can you tell me what the address is? Question: Who has spoken the sentence 4? (A) User (B) System
[A]: Answer: (A) User


[Q]: Sentence1: Yes, after 8:30 would be best. Sentence2: I have booked you a train ride on TR6488 which will depart at 09:21 and will arrive at 10:10. The total fee will be 10:24GBP. Would you like the reference number? Sentence3: No thank you. Thanks for your help. Sentence4: Great, thank you. That's all I needed. Sentence5: What is the total travel time? Sentence6: The post code is cb21ab and the phone number is 01223323737. Where would you like to book a train to? Sentence7: Where are you departing from? Sentence8: I would like the post code and phone number for the restaurant please, and I would like to book a train. Sentence9: The total travel time will be 49 minutes. Sentence10: You're welcome. Is there anything else I can do for you today? Sentence11: I'm leaving from Cambridge. Sentence12: I think something cheap. If not, go up to moderate. Sentence13: Do you have a time in mind? Sentence14: Good day to you. Sentence15: I suggest pizza hut city centre, it has a cheap price range. Would you like me to book it or would you like more information? Sentence16: Yes, Please book the reservation. Sentence17: I need to go to Stevenage on Sunday. Sentence18: I'd be happy to book a table for you. Please let me know the day, time, and the number of people in your party. Sentence19: There are nine of them. What price range do you prefer? Sentence20: I am looking for an Italian restaurant located in the centre of Cambridge. Question: Who has spoken the sentence 15? (A) User (B) System
[A]: Answer: (B) System


[Q]: Sentence1: That is all for now. Thank you Sentence2: I'm open to it, and I suppose the centre will do. But I'd prefer the west side if there is one. Sentence3: That's okay, Cityroomz will work. Can you book it for 3 people for 2 nights starting on Tuesday? Sentence4: Yes I am looking for a Train that departs from Cambridge and arrives at Birmingham New Street. Sentence5: Yes. Please select the first train available after 14:30 and book 3 tickets. then provide me the reference number Sentence6: Reference number is : Z9RFJQ4W . Anything else you need? Sentence7: Booking was successful, the total fee is 225.3 GBP payable at the station. Reference number is : XMBOA4E1 . Can I help with anything else? Sentence8: Would you like to try cityroomz? I can book it for you? Sentence9: I'm so sorry. There are no hotels on the west side that match your requests. Sentence10: Cityroomz is moderately priced and in the centre. Are you open to places that offer free parking, or do you specifically want to avoid it? Sentence11: Thank you for contacting us. Have a great day! Sentence12: I need a place to stay in Cambridge that includes free wifi. I don't need free parking. Sentence13: I will be leaving on Wednesday after 14:30. Sentence14: Ok. When were you looking to leave? Sentence15: Is it in the West? what is the price range? Sentence16: There are 9 trains listed. Would you like tickets for one of them? Question: Who has spoken the sentence 7? (A) User (B) System
[A]:
Answer: (B) System