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 am looking for Mediterranean food in the center of the city. Sentence2: I show 3 available. 2 are in the expensive range and 1 is cheap. May I book a table for you? Sentence3: Thanks for calling. You have a great day! Sentence4: I have booked you at the Shiraz Restaurant for 7 people Saturday at 15:45. Your table will be reserved for 15 minutes. Sentence5: I'd like the expensive range and I'd like to book a table for 7 people on Saturday at 15:45. Sentence6: Great. Thanks so much! Sentence7: Thank you so much. That is all I need today. Have a great evening. Sentence8: Sure. Your reference number is MSV3UPS2 . You will likely need it. Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Are there any that serve north american food? Sentence2: yes. please book for me a table for thee tommorow diner at 8 pm Sentence3: There phone number is 01223312598. Is there anything else I can assist you with? Sentence4: Yes, there is gourmet burger kitchen. It is an expensive restaurant. Would you like me to book it for you? Sentence5: Yes, the University Arms Hotel is located in the centre area and is on Regent Street. Would you like me to book a room for you? Sentence6: Okay can you also help me with a restaurant that serves Cantonese food in the city center? Sentence7: I just need their phone number. Sentence8: I need information on the university arms hotel. Sentence9: No I am good for now, thanks for all of your help. Sentence10: I need more info. Does the hotel have free parking and what is the price range? Sentence11: There aren't any restaurants in the city centre that serves Cantonese food. Would you like to try a different type of cuisine or try a different area? Sentence12: Thank you for contacting us and have a nice day. Sentence13: You asked about a hotel. Would you like to book a room or would you like me to help find a restaurant? Sentence14: It is in the expensive price range, but it does have free internet and free parking. Question: Who has spoken the sentence 9? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: Okay. I have booked you for 2 at 12:00 at the Dojo noodle Bar on Sunday. Sentence2: 12:00 please, I will need a reference number. I also need a train that goes to stansted airport leaving after 10:30. Sentence3: Great thanks so much. Can you give me the reference number and also I need to get a train when your ready. Sentence4: Booking was successful for TR8207, the total fee is 20.2 GBP payable at the station. Your reference number is W7D3D21R . Is there any further assistance needed? Sentence5: Yes that is perfect, please also provide me with the reference number. Sentence6: I am looking for a cheaply priced restaurant in the centre of Cambridge. Sentence7: That should be all thank you Sentence8: No I'm not picky, anything is fine as long as it's in the centre of town. I need to make a reservation for 2 on Sunday. Sentence9: I need the train to leave Cambridge on Monday after 10:30 and go to Stansted Airport, and I need two tickets. I also need my reference number please. Sentence10: The reference number is RLOFK7YF . What do you need for your train? Sentence11: Have a great trip! Sentence12: What time would you like your reservation? Sentence13: There are a large number of options to choose from. Do you have a preference for the type of food you would like? Sentence14: There are 14 trains leaving Monday from cambridge to stansted airport after 10:30. The closest departure to that would be TR8207 leaving at 10:40. Shall I book this for 2? Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]:
Answer: (A) User