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

Sentence1: What day are you travelling? Sentence2: You are very welcome. Enjoy your day too. Bye. Sentence3: I'd like to book 3 tickets on the train arriving at 19:08, please. And would it be possible to have a reference number for the booking? Sentence4: I will need to leave from Cambridge if that's ok Sentence5: I have a train that arrives earlier at 18:08 and one that arrives just before your specified time at 19:08. Sentence6: Sure. Where will you be leaving from? Sentence7: I was wondering if you could help me in finding a train to the airport. Sentence8: OK, you have 3 tickets reserved on TR4447, departing Cambridge at 18:40, arriving Stansted at 19:08. Total fee is 30.29 GBP. Reference #5VRJSMSE . Will that be all today? Sentence9: Yes, it will. Thanks so much. Have a nice day. Sentence10: On Wednesday. I need the train to arrive by 19:15. Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System

Sentence1: Of course, silly me. I'd like to travel from Cambridge to London Liverpool Street on Saturday, and I need to get there by 19:00 please. Sentence2: Allright. TR0357 departs at 09:39. Would you like me to book you tickets? Sentence3: Thanks for the help, that's all for now. Sentence4: Sure! Their number is 01223227330. Sentence5: Well, I want to leave on Saturday. You tell me the best options. Sentence6: I would like to arrive by 19:00. Sentence7: A ticket from London Liverpool Street to Cambridge is 13.28GBP. Sentence8: I also need their phone number. Sentence9: Can you tell me where you are leaving from and going to? Sentence10: what days look like the best ones to get a great deal on hotel with train ride. Sentence11: Can you help me find a train for my upcoming trip to your city? Sentence12: Absolutely, the address is 15-19 Trumpington Street. Is there anything else I can assist you with today? Sentence13: Ok, I'll have to speak with my friend to see if that price is acceptable. Can I please get the address to the restaurant Hotel Du Vin and Bistro? Sentence14: There are 202 options that day! Do you know what time you want to leave or arrive? Sentence15: Can you give me the ticket price? Sentence16: I hope you have a good trip. Have a nice day. Goedbye Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System

Sentence1: How about just one night instead? May I have the reference number please? Sentence2: Sunday. Could you please send me the reference number? Sentence3: Yes, I would like a guesthouse with a 0 star rating. Sentence4: El Shaddai sounds fine. I need to reserve it for two adults for two nights, please. Sentence5: There is city centre north b and b, and el shaddai which would you like to book? Sentence6: Sure, the 15:17 train's id is TR7931. Is there anything else I can help you with? Sentence7: I want to depart from london kings cross after 13:30. Sentence8: Sure, the first train leaves at 15:17. Would you like to book it? Sentence9: You are very welcome. Enjoy your stay! Sentence10: There are 200 trains coming to Cambridge on Sunday. Is there a particular time or departure location you're interested in? Sentence11: Great, that was a successful booking, the reference number is 9H97D0MB . Is there anything else I can help with? Sentence12: No that's all, thanks! Sentence13: I am also looking for a place to stay. I would like the hotel to have free parking and free wifi. Sentence14: I'm looking for a train leaving on Sunday that is going to Cambridge. Sentence15: Alright, what day will you be staying? Sentence16: No, I would like to book at a later time, but can I please get the train ID? Sentence17: My listings show almost 30 separate lodgings around town with free wifi and parking! Do you have any other preferences to help me pick one for you? Sentence18: Unfortunately the booking was unsuccessful. Would you like me to book it for another day or duration? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User