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

Ex Input:
Sentence1: No, but I would like to find a cheap priced south african restaurant. Sentence2: I'm sorry, but we don't have and South African restaurants in the area. Is there a different type of food I can help you find? Sentence3: I would say let's look for an attraction first. Can you recommend something to do in the south part of town? Sentence4: I will go with whatever you recommend, I just need the attraction type and postcode. Sentence5: Hi, I am looking forward to trying some of your local restaurants. I do need help with some other places to go in town while I am there though. Sentence6: There are several nice parks in the area as well as theaters and museums. Sentence7: The byard art museum postal code is cb21sj. Can i help you get transportation to and from the museum? Sentence8: Try Portuguese then. Sentence9: Thanks so much for putting up with me! You've been great! Sentence10: 3 people will be dining. Please give me a reference number once you finish the reservation Sentence11: I would rather be in the south area. Sentence12: What is your food type preference? Sentence13: There are two results. Both are cheap. Do you prefer the south or centre? Sentence14: I have finished booking it for Thursday at 12:15 for 3 people at Nando, your reference number is TDQZGM38 . Do you need anything else? Sentence15: Can you book a table for me there on Thursday at 12:15? Sentence16: The only option is nandos. Sentence17: You are welcome enjoy Sentence18: How many people are in your party? Question: Who has spoken the sentence 15? (A) User (B) System

Ex Output:
Answer: (B) System

Ex Input:
Sentence1: The Hotpot is an expensive Chinese restaurant in that area. Sentence2: Great can I get their phone number as well please? Sentence3: You're quite welcome! Thanks for contacting the Cambridge TownInfo Centre and have a great day! Sentence4: Would you like to eat Asian Oriental, Chinese, European, or French? Sentence5: No thank you. Have a great day! Sentence6: I am looking for an expensive place to dine in the north. Sentence7: The phone number for the hotpot is 01223366552, would you like me to book you a table? Sentence8: I think Chinese may have caught my attention. Question: Who has spoken the sentence 1? (A) User (B) System

Ex Output:
Answer: (B) System

Ex Input:
Sentence1: I need a place to stay that is cheap. Sentence2: Nope, that's it. Thanks! Sentence3: I don't care what part of town it is in. Sentence4: What is the reference number? Sentence5: Sorry there are no hotels that meet that criteria. Can I try a different area for you? Sentence6: Reference number is : YBUKJ2IZ . Would you like restaurant reservations or information on area attractions? Sentence7: I found a 4 star hotel in the east area that is cheap. It's called the allenbell, would you like me to book it for you? Sentence8: Your booking was successful. Is there anything else I can help you with? Sentence9: Glad I could help. Thank you Sentence10: I actually want a 0 star location and with free parking too Sentence11: Sure. There will be 5 people for 5 nights and we will be arriving on Wednesday. Sentence12: The El Shaddai is a guesthouse in the centre of town. Would you like me to book that for you? Question: Who has spoken the sentence 1? (A) User (B) System

Ex Output:
Answer: (B) System