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

Positive Example 1 -
Input: Sentence1:i need a place to dine in the center thats expensive Sentence2: I have several options for you; do you prefer African, Asian, or British food? Sentence3: Any sort of food would be fine, as long as it is a bit expensive. Could I get the phone number for your recommendation?Question: Who has spoken the sentence 2? (A) User (B) System
Output: Answer: (A) User

Positive Example 2 -
Input: Sentence1: Guten Tag, I am staying overnight in Cambridge and need a place to sleep. I need free parking and internet. Sentence2: I have 4 different options for you. I have two cheaper guesthouses and two expensive hotels. Do you have a preference? Sentence3: No, but I'd really like to be on the south end of the city. Do any of those fit the bill? Sentence4: Sure. Does price matter? We can narrow it down and find exactly what you need. Question: Who has spoken the sentence 4? (A) User (B) System
Output: Answer: (B) System

Negative Example 1 -
Input: Sentence1: I am looking for a hotel named alyesbray lodge guest house. Sentence2: i have their info, what would you like to know? Sentence3: I would like to book a reservation for it. Can you help me with that? Sentence4: I sure can. First, I will need to know when you want your stay to begin and how many days you'll be staying. Also, how many people will be staying? Question: Who has spoken the sentence 1? (A) User (B) System
Output: Answer: (A) User

Negative Example 2 -
Input: Sentence1: Hi there! Can you give me some info on Cityroomz?. Sentence2: Cityroomz is located at Sleeperz Hotel, Station Road in the Centre area. It is a moderatley priced hotel with a 0 star rating. Would you like to book a room? Sentence3: Yes please. I need it for 7 people for 3 nights starting on tuesday. Sentence4: How many days would you like to book it for? Question: Who has spoken the sentence 4? (A) User (B) System
Output: Answer: (A) User

Now complete the following example -
Input: Sentence1: No, that's all. Thanks again for your help. Sentence2: I show five that fit your criteria. May I ask the location you are in? This would help refine our search. Sentence3: Thank you for using our service. Sentence4: Great Yes it is and thank you. Sentence5: La Margherita was unavailable. I was able to book you at Zizzi Cambridge which is in the same price range. Your reference number is QRJ5MP30 . Is this acceptable? Sentence6: Okay as long as it's in the same price range. Sentence7: Can you please help me find a cheap italian restaurant? Sentence8: If there is one that you know of that you recommend, that would be fine. I don't know any, so some guidance would be great. Sentence9: Would you like more details on any of the available restaurants before booking a table? Sentence10: It doesn't matter what area. Can you book a table for 2 people at 11:00 on Wednesday. Sentence11: How about la margherita? Sentence12: Will you be needing anything else today? Question: Who has spoken the sentence 7? (A) User (B) System
Output: 


Answer: (B) System