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

[EX Q]: Sentence1: Sorry. TR2052 departs from leicester and the destination is cambridge. It leaves at 15:09 on Wednesday. Would you like me to book it for you? Sentence2: Yes, I only need 1 ticket for myself. Sentence3: There are 13. I could recommend Trinity College on Trinity Street. Or would you like information about one of the others? Sentence4: I would like to arrive by 17:00 in leicester. Sentence5: I would like help finding a college to visit in the centre of town. Sentence6: Of course. The address is Trinity Street, postcode is CB21TQ, and the entrance fee is one pound. Can I help you with anything else? Sentence7: Yes and please give me the reference number. Sentence8: OK, I've booked one ticket for you on TR0451 from cambridge to leicester, arriving at 16:06. Ref# 8OZNJHMO . Can I help you with anything else today? Sentence9: That sounds good. Could you give me the entrance fee, phone number, and postcode? Sentence10: Certainly. Just to verify, are you traveling alone? You would only like one ticket? Sentence11: TR3702 LEAVES AT 05:00 CAN I BOOK THAT ONE FOR YOU? Sentence12: How early do you wish to arrive? There are 11 trains that will get you there before 17:00. Sentence13: Thank you for using our service. Have a good night. Goodbye. Sentence14: Does this train go to Leicester from Cambridge? Sentence15: Yes I'm also looking for a train that leaves wednesday and arrives by 17:00. Sentence16: I think that is all I need, thank you. Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Yes, all of the listed entrance fees are 5 pounds. The Club Salsa is nice. Sentence2: Have fun! Goodbye! Sentence3: Club Salsa's address is 1 Station road and their phone number is 07782218745. Sentence4: No thanks. That's it. Sentence5: Location doesn't really matter. Is there an entrance fee? Sentence6: Yes, would you like to find a nightclub in the centre or south part of town? Most of them are in the centre. Sentence7: Club Salsa sounds right up my alley. Can I get the address and phone number please? Sentence8: Can you find information about nightclubs? Sentence9: You're welcome. Can I help you with anything else? Sentence10: Okay, great! Thanks for your help! Question: Who has spoken the sentence 7? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: That is all for now. Thank you so much. Sentence2: Yes, I would consider a star rating of 4. Can you pick one for me please? Sentence3: You are so welcome! You take care now, bye! Sentence4: I have booked it and here is the information-Booking was successful, the total fee is 105.6 GBP payable at the station . Reference number is : SLAC2W0W . Sentence5: There are several trains departing from Cambridge on Saturday. Where are you traveling and what time would you like to leave? Sentence6: Okay, I booked it and your reference number is CEVX0OU3 . Anything else? Sentence7: huntingdon marriott hotel is a 4 star hotel Sentence8: Yes please! I want to book it for 8 people for 4 nights starting tuesday Sentence9: There are multiple trains leaving that day after 12. First one departs at 12:06. Sentence10: Yes, the Huntingdon Marriott Hotel has free WiFi. Would you like me to book it for you? Sentence11: I'm sorry, I am not able to find a 5 star hotel with free internet. Would you consider a 4 star hotel? There are 3 of those. Sentence12: Oh I almost forgot can you help me find a 5 star hotel with free internet? Sentence13: Thank you that is all I need Sentence14: Ok and does that have free wifi? Sentence15: I'm going to Peterborough and want to leave after 12:00. Sentence16: Book the first one for 8 people please. Sentence17: Can you help me find a train departing out of cambridge this saturday? Sentence18: Thank you for contacting us. Have a nice day. Question: Who has spoken the sentence 2? (A) User (B) System
[EX A]:
Answer: (A) User