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

[Q]: Sentence1: I'm also looking for a train. It should depart Cambridge after 14:15 and arrive in Norwich on friday. Sentence2: I have a 3 star hotel and a 4 star hotel both in the centre. Would you like to book one of them? Sentence3: I'm looking for a hotel to stay at. I want it to be at least 2 stars and in the center of town. Sentence4: TR8314 departs Cambridge at 14:36 and arrives in Norwich at 15:55. Would you like me to book a ticket for you? Sentence5: 1 ticket on TR8314 has been booked. Your total is 17.6 GBP, which you can pay at the station. Your Reference number is : H0JS8RMF . Sentence6: I am not finding a 2 star in the centre. Are you sure there is not another type of hotel you would like? Sentence7: Do you have anything that is 2 star rated in the centre? Sentence8: YES PLEASE. FOR 1 PERSON. Sentence9: I have 2 options - one is cheap and one is expensive. Which price range would you prefer? Sentence10: Thank you for calling. Have a great day! Goodbye. Sentence11: I do need a place to stay, so are there any 4 star hotels available? Sentence12: we got none. can i help you with anything else? Sentence13: That is all I need. Sentence14: cheap will work. can you book it for Wednesday? 1 person, 2 nights. I'll need the reference number too. Sentence15: Thanks, that was all I needed today. Goodbye. Sentence16: I was able to book a room at Alexander bed and breakfast, your reference number is VWF48IZM . Is there anything else I can help with? Question: Who has spoken the sentence 12? (A) User (B) System
[A]: Answer: (A) User


[Q]: Sentence1: Could you check the spelling(city centre north b and b) and try to search again? Sentence2: The TR2512 takes 51 minutes. Anything else you need? Sentence3: I will be traveling on Thursday. Sentence4: It is a cheap, 0 star guesthouse located at 328a histon road on the north side. It has free internet and parking. Phone number and postcode are 01223312843 and cb43ht. Sentence5: Yes I am looking for information on a hotel called City Center North B and B. Sentence6: Sure! give me the following information: Day of visit, number of people and number of days that you will be staying. Sentence7: I cannot find that hotel. Any other hotels you would like to find? Sentence8: You're all set. Your reference number is HOSVDEGA . Can I help you with anything else today? Sentence9: Do you have a time preference? Sentence10: Well that will not work. Sentence11: I need to arrive by 14:15. Sentence12: there are many trains but you need to tell us which day you want to travel Sentence13: I am also looking for a train into Cambridge from London Kings Cross. Sentence14: Please book for 2 people starting on thursday for 4 nights. Sentence15: enjoy your stay in Cambridge! Sentence16: The TR2512 will fit your needs. Would you like to book this train? Sentence17: The first train leaves at 5:17. Sentence18: Thank you. Are you able to book that for me? Sentence19: Not at this time. What is the travel time for that train, please? Sentence20: no that will be all thanks Question: Who has spoken the sentence 19? (A) User (B) System
[A]: Answer: (B) System


[Q]: Sentence1: Restaurant Two Two is a French restaurant located in the north part of town, but it is pricey. Would you like more information? Sentence2: Good bye. Sentence3: The address is 22 Chesterton Road. Sentence4: There is one in the centre of town and one in the north area of town. Which one would you prefer? Sentence5: I am looking for a French restaurant. Sentence6: Thank you, good bye. Sentence7: North Part of Town Sentence8: Yes, what is the address of Restaurant Two Two? Question: Who has spoken the sentence 3? (A) User (B) System
[A]:
Answer: (B) System