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

Sentence1: Booking was successful for the bridge guest house. Your Reference number is : LBEOV690 . Sentence2: Yes please. Which is the cheapest? Sentence3: Thank you. Have a nice day. Sentence4: No. I would like to make a reservation for Wednesday for 3 nights and 8 people. I will also require a reference number. Sentence5: I was unable to book your stay at any of the three hotels. Would you like to change the length of your stay or change the day? Sentence6: There are 2 hotels with a 3 star rating and free parking. Would you like to stay in the centre or south? Sentence7: Sorry, I was mistaken. There are 3 guesthouses matching your request. One each in the south, north, and west. Would you like to book one? Sentence8: Thank you. Have a nice day. Sentence9: Can you please try a 2 day stay. Sentence10: I can only tell you they are all in the moderate price range. Do you have any other preferences? Sentence11: I am looking for a hotel with a 3 star rating and free parking Sentence12: Either is fine. I'd like a guesthouse. Question: Who has spoken the sentence 5? (A) User (B) System
Answer: (B) System

Sentence1: I believe that's all I need. Thanks! Sentence2: It is an expensive restaurant on the west side of town. Would you like me to reserve a table for you? Sentence3: Yes I have many options for you. How about the Tandoori Palace? Sentence4: I'm looking for an Indian restaurant in the west. Sentence5: That might work. What is the price range of Tandoori Palace? Sentence6: Sure, it is located at 68 Histon Road Chesterton in the cb43le post code. Can I help with anything else today? Sentence7: You are welcome. Have a nice day. Bye. Sentence8: No that's OK, but could you give me their address and postcode please. Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System

Sentence1: The Lucky Star is cheap and serves Chinese food. Sentence2: There are a total of 21 hotels in cambridge with a 4 star rating. Would you prefer a certain price range or location? Sentence3: Great! What day would you like to book? Anything else you want to share? Sentence4: Is there anything that is cheap, and in the south that could serve Singaporean food? Sentence5: OK, a guesthouse will be fine. Sentence6: You're welcome! Have a great trip! Sentence7: I also am looking for a hotel with a 4 star rating. Sentence8: I was able to book that for you. The car type is a White Honda and the contact number is 07321469386. Is there anything else I can help with? Sentence9: Can you book me a taxi to bring me between the two? I am wanting to leave the hotel by 16:45. Also can I have the contact number and car type? Sentence10: Where is a good cheap Singaporean place to eat? Sentence11: I am looking for a cheap place in the south. Sentence12: Great thank you that's all that I needed today. Sentence13: There are no hotels meeting those criteria in the south however Rosa's Bed and Breakfast guesthouse with 4 stars priced cheap is available. Sentence14: My system isn't showing anything, do you have a particular name or any alternative type restaurants you would like me to try? Sentence15: The phone number is 01223244277, address is Cambridge Leisure Park Clifton Way Cherry Hinton, and postcode is cb17dy. Sentence16: Sorry there is not restaurant matching your request available. Would you like to select a different food type to see what we can find? Sentence17: That'll be great. Can I get the phone number, address, and postcode to that please? Sentence18: Yes, can you find me a cheap place to eat serving chinese food? Sentence19: The phone number for Rosa's Bed and Breakfast is 01223512596 and the postcode is cb22ha. Can I help with anything else? Sentence20: I don't wish to book. Can I just get the postcode and phone number? Question: Who has spoken the sentence 15? (A) User (B) System

Answer: (B) System