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

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

[EX Q]: Sentence1: I'd like to find an expensive restaurant in the north part of town. Sentence2: The restaurant should serve asian oriental food. Sentence3: You are welcome. Sentence4: Yes, I would like to be booked for a table for 8 on 19:45 on a Saturday, and could I also get the reference number? Sentence5: Your reservation has been made and the reference number is 3P2ALRY0 . Sentence6: I have one restaurant called saigon city on 169 high street chesterton chesterton. Would you like me to book for you? Sentence7: There are many restaurants in the North that match your description, what type of cuisine are you interested in? Sentence8: Thank you for your help. Question: Who has spoken the sentence 3? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: I'm sorry. I'm not showing any British restaurants in the centre of town, either? Would you like to try another part of town or a different type of food? Sentence2: Ok, anything british will do. I need to book a table for 8 people on Monday at 15:30. Sentence3: They do. Would you like me to book it? Sentence4: There a no Irish places in the centre, in that price range, nor any in town. Shall I try some British food? Sentence5: Yes and can you tell me whether they have free wifi? Sentence6: Yes, please. That sounds perfect. Sentence7: Unfortunately no restaurant matches that search criteria. Could you like to look at other areas? Sentence8: cityroomz hotel in the center is moderately priced. It's located at sleeperz hotel, station road. phone number is 01223304050. shall I book it for you? Sentence9: And will you also be checking in on Monday? Sentence10: restaurant one seven is in the centre and its serves british food and it's in the moderate price range. Would you like me to book a table for you? Sentence11: I need a restaurant that serves Irish food and is in centre of Cambridge Sentence12: Any restaurant then I guess will have to do located in the centre that is moderately priced. Are you SURE their aren't' any Irish restaurants? Sentence13: The address is sleeperz hotel, station road. Sentence14: No, these restaurants aren't graded with stars. But I do have a reservation for you. The reference number is U3AG4VDD . Can I be of further help to you today? Sentence15: Please. And can I have the confirmation number as well? Can you tell me if that is 3 stars? Sentence16: Yes, may I confirm the address of this hotel please? Sentence17: Thank you for using our system. Sentence18: Yes. I would like a hotel in the same area as the restaurant. I'm not driing so I don't need free parking. Sentence19: Great. That is all the information I need. I will book the room later on my own. Thanks a bunch. Goodbye. Sentence20: Ok how many people and how many nights? Sentence21: just me for one night please Sentence22: Yes please try British. Question: Who has spoken the sentence 10? (A) User (B) System
[EX A]:
Answer: (A) User