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

[EX Q]: Sentence1: I have a train leaving at 18:11. Will that do? Sentence2: You're welcome. Have a nice day. Sentence3: You train has been booked. Total fee is 19.6 GBP which is payable at the station. Your reference number is 5PVB9XYJ . Sentence4: Arrival time does not matter, just leave after 17:30 Sentence5: Milton Country Park is in the north and has free admission. Sentence6: Is there a time you would liek to arrive by? Sentence7: Hello, I'm looking for a place to go in the north. Could you suggest some places? Sentence8: That would work. Can you book that please? Sentence9: Perfect! That is all I needed. Thank you for the help. Goodbye! Sentence10: I need to book for two people and I need the reference number. Sentence11: Can I get the phone number please? Sentence12: Absolutely. Their phone number is 01223420060. Is there anything else I can assist you with? Sentence13: I'm leaving Kings Lynn on Wednesday. Sentence14: Yea I also need a train that goes to cambridge and should leave after 17:30. Sentence15: How many people would you like to book? Sentence16: What day will you be traveling, and where would you like to depart from? Question: Who has spoken the sentence 2? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: I'm sorry, I only know that it is moderately priced. Can I book a room for you? Sentence2: What is the price range? Sentence3: Is there a particular area of the city where you'd like to stay? Sentence4: No that's all. Thanks! Sentence5: Yes. There are a number of hotels with wifi. Archway House is one of them that I can recommend. Sentence6: You have a nice day. Good bye. Sentence7: Howdy! I'm in town for the night and need a place to stay. I'd like a four star joint with free parking, if you please. Sentence8: no that's fine. Sentence9: Nice! I hope you enjoy this beautiful city, I found 5 hotels for you. What is your price range? Sentence10: Is there anything else you will need today? Sentence11: Archway house is in the moderate price range. They are located at: 52 gilbert road. Anythign else you need? Sentence12: I have 16 guesthouses that are 4 star and have parking, do you have any other requirements to help narrow the search? Sentence13: I don't have a price range. As long as it's nice. Sentence14: Sure, what is its address and price range? Sentence15: Do any of those have free wifi? Sentence16: No, I don't care about the area, either. But do you have a guesthouse? Question: Who has spoken the sentence 1? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: Okay, you're all set! I have it booked for Sunday, 18:00, and for 2 people. Your reference number is LR4G3953 . Is there anything else I can help with? Sentence2: What does Cambridge offer so far as expensive, German restaurants? Sentence3: You are welcome. Are you certain I can't help with a hotel or a train for you? Sentence4: Thank you for calling and have a great trip to Cambridge. Goodbye. Sentence5: That is all I needed. Thank you! Sentence6: Yes, actually, I'm looking for a train. I'll need to depart from Cambridge after 20:00. Sentence7: I'm terrible at math. What time does that arrive? Sentence8: i want to travel on sunday. i need to leave cambridge at 20:00. Sentence9: Is there any asian oriental restaurants in the north area? Sentence10: There's no restaurants meeting your criteria. Would you like to change anything parameters? Sentence11: Would you like to search for something else? Sentence12: I am going to Ely on Sunday. Sentence13: TR0537 leaves at 21:50 and arrives in 17 minutes. Do you want tickets for that? Sentence14: Yes, there is one called Saigon City. Would you like more information? Sentence15: Thank you for all your help. Have a great day. Sentence16: We have lots of those! Where are you traveling to? Sentence17: The arrival time is 22:07. Sentence18: I would like you to book it. 2 people 18:00 on Sunday. Sentence19: Oh really? I was hoping to eat expensive German cuisine in the northern part of town. Sentence20: What day will you be taking the train? Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]:
Answer: (A) User