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

[EX Q]: Sentence1: It doesn't matter, I just need to get there. Sentence2: I am sorry but that time is not available. Would you like to try another time or day perhaps? Sentence3: There is a restaurant called restaurant alimentum that meets your criteria. Sentence4: It's all booked, you're looking for a black volkswagen and their contact number is 07263669645. Sentence5: As a matter of fact, it appears all of the gastropubs in Cambridge have closed. Is there anything else that interests you? Sentence6: Have a great day! Sentence7: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 8HB62Z6W . Is there anything else I can help you with? Sentence8: Sure. What time would you like to leave the restaurant? Sentence9: I am looking for a gastropub in the south. Sentence10: The address is cambridge leisure park, clifton way. Can I do anything else for you? Sentence11: Yes, I'd like to see some entertainment near the restaurant. Could you recommend me something good? Sentence12: Are there any Gastropubs in town? Sentence13: Yes, it is. Nusha is in the South as well. Sentence14: Yes, I would like to book a taxi from the restaurant to the entertainment. Sentence15: How about Tenpin in the south? Sentence16: Great, thank you so much for your help! That's everything I'll need today! Sentence17: Thank you for contacting Cambridge TownInfo centre. Goodbye! Sentence18: That will do. Please get me their address. Sentence19: How about a modern European cuisine in the south area? Sentence20: Let's book that for 12:45 on Tuesday. It will be for 7 people. Sentence21: I'm sorry I couldn't find any Gastropubs in the South. Is there another type or area which you would like to try? Sentence22: Splendid! Thank you for all your help. That's all I need. Goodbye. Sentence23: Could you try 11:45 please? Sentence24: Is it located near Alimentum? I'm looking for something in the same area as the restaurant. Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Are there any with a 5 star rating? Sentence2: I'm looking for a place to stay with free wifi. Can you help me find something moderately priced? Sentence3: You are booked at the acorn guest house. Reference number is ROCCFCM6 . Sentence4: Thank you so much, that is all I need. Sentence5: Unfortunately, none of them have a 5 star rating. Sentence6: Are there any with a 4 star rating? Sentence7: We have plenty of moderately priced options with free WiFi. Do you have any additional preferences? Sentence8: Oh yes, several. Are there any addition preferences on those? Sentence9: Great, enjoy your stay. Bye. Sentence10: Nope, any 4-star moderate place with wifi will be fine. Could you book a room starting Saturday for 3 nights, 5 people? Question: Who has spoken the sentence 6? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: The TR2819 fits the bill, would you like me to book you passage? Sentence2: There are 133 trains traveling from Stansted Airport to Cambridge between Friday and Wednesday. What day did you want to travel? Sentence3: I need to a train that goes to Cambridge, from Stansted Airport. Sentence4: No, that's it. Thank you. Goodbye. Sentence5: Alright I've made that booking they will hold the table for 15 minutes and the reference # is 0VES7LP4 . Is there anything else i can help you with? Sentence6: i would like to travel friday around 2pm Sentence7: There is The Gardenia in the centre that meets your criteria. Would you like me to book it for you? Sentence8: Did I mention I need two tickets? There are 2 of us. Sorry. Sentence9: Not a problem. The reference number is BYTSKQJT, and the price is 20.2 GBP, payable at the station. Is there anything else I can assist you with? Sentence10: Booking was successful, the total fee is 10.1 GBP payable at the station .Reference number is : LQ076J6Z . Sentence11: I also want to find a restaurant that serves Mediterranean food for a cheap price. I'd like a reservation for 2 people that same day. Sentence12: yes please and a reference number please thank you Sentence13: You're welcome, have a great time. Sentence14: Sure, please book it for saturday at 17:15, for 2 people. And tell me the reference number Question: Who has spoken the sentence 1? (A) User (B) System
[EX A]:
Answer: (B) System