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

[EX Q]: Sentence1: Thanh binh is a nice restaurant that serves Vietnamese food and is in the cheap price range. Sentence2: That sounds great! May I have their phone number please? Sentence3: Thank you for using the Cambridge restaurant system, please call again. Sentence4: Okay, thank you for your help! Sentence5: How about vietnamese food, please? Sentence6: I am looking for a restaurant that serves Malaysian food and is in the cheap price range. Sentence7: thanh binh's phone number is 01223 362456 Sentence8: No matches found for cheap Malaysian food. Would you like something else? Question: Who has spoken the sentence 1? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: No thank you. Can I have to phone number and postcode for that restaurant? Sentence2: I need a train to Kings Lynn. Sentence3: Thank you for using our service. Sentence4: The earliest train leaving after 17:00 on Friday leaves at 17:11. Would you like me to book this train for you? Sentence5: That would be TR9226 Sentence6: The phone number is 01223247877. It's located in the cb13nl postcode. Sentence7: Hmmm....how about an expensive restaurant serving gastropub food in the east? Sentence8: Thank you, goodbye. Sentence9: I am looking for a restaurant in the east that serves international food. Sentence10: No. There are two moderately priced restaurants with international cuisine in the centre of town. Would you like to hear about those? Sentence11: Book it, please. I need a single ticket. Sentence12: The the missing sock fits that criteria and is in the cheap price range. How else can I assist you? Sentence13: What day would you be wanting to travel? Sentence14: There's one restaurant that fits your requests, would you like me to book a reservation? Sentence15: Thanks again for the information! Sentence16: Have a great time. Sentence17: Have a great day as well. I think you'll love the Royal Standard. Sentence18: Thank you so much. Have a nice day! Sentence19: Friday please. From Cambridge leaving after 17:00 Sentence20: Can you give me the train ID on that one please? Sentence21: Is there one in the expensive? Sentence22: You have been booked for the train. Your reference number is 0UIC4MX9 . Can I help you with anything else? Question: Who has spoken the sentence 20? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: I think i can get for you anything else Sentence2: The Bishops Stortford to Cambridge at 15:29 is scheduled to arrive at 16:07. The one before that is two hours earlier. Sentence3: There are many attractions do you want a church,or park or water slide ? Sentence4: I was looking for entertainment, but if there is nothing how about a college? Sentence5: TR1392. 10.10 pounds. Is there anything else? Sentence6: Can you help me find a train going to cambridge leaving on tuesday? Sentence7: I'll be departing Bishops Stortford. My departure time is flexible, but I need to arrive by 16:30. Sentence8: Could you give me the price and train ID for that one please? Sentence9: Where are you departing from and what is your departure time? Sentence10: I'm looking for places to go in town centre. I'm interested in entertainment. Can you suggest a place to go? Question: Who has spoken the sentence 8? (A) User (B) System
[EX A]:
Answer: (A) User