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

[EX 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
[EX A]: Answer: (B) System

[EX Q]: Sentence1: There's a lot to do in the south. There's a cinema, entertainment, museum, nightclub, park, and theatre. What sounds good to you? Sentence2: Maybe we can do a picnic in the park. Can you tell me about what's available? Sentence3: That sounds great, thank you. I'm also looking on information on trains arriving from cambridge by 15:15. Sentence4: you're welcome. i hope you'll have a wonderful and adventurous picnic. Goodbye Sentence5: How about wandlebury country park that is located in the south park of town? It is also free. Sentence6: No thank you. Sentence7: My pleasure. Can I help you with something else? Sentence8: Your best bet would be the TR3685 which leaves Cambridge on Friday at 13:00 and gets to London Kings Cross at 13:51. Sentence9: Okay and what day would you like to travel? Sentence10: I'm feeling adventurous and would love to get recommendations about places to visit in the South Sentence11: Perfect. Thank you for your help today. Sentence12: I would like to travel to london kings cross on friday. Question: Who has spoken the sentence 5? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: From Leicester to Cambridge, please. Sentence2: The postcode is cb21rt and the address is Doubletree by Hilton Cambridge Granta Place Mill Lane, will that be all? Sentence3: Okay, we have a LOT of trains leaving after that time. What is your starting point and destination? Sentence4: Thank you for using Cambridge TownInfo centre. Please consider us for your future travel needs. Sentence5: Try riverside brasserie, it is located at Doubletree by Hilton Cambridge Granta Place Mill Lane Sentence6: Is that in the centre of town? Is it moderately priced? Sentence7: OK, the TR9776 leaves at 11:09 and arrives at 12:54, the cost is 37.80 pounds, do you want me to book you? Sentence8: Ok, you are booked. Your reference number is OYDBAUOS . The total is 37.79 GBP payable at the station . Is there anything else I can help you with? Sentence9: I just need the adress and post code. Sentence10: I am looking for a restaurant that serves Modern European food at a reasonable price. Sentence11: It is indeed in the Centre and moderately priced. Would you like me to book a table for you? Sentence12: Yes please book the train for 1 person and make sure you give me the reference number. Sentence13: I also need to take a train on wednesday, leaving after 10:15. Sentence14: I don't think so. That was everything. Thanks. Goodbye. Question: Who has spoken the sentence 13? (A) User (B) System
[EX A]:
Answer: (B) System