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: Worth House matches your criteria. Would you like me to book that for you? Sentence2: What about Italian food? Sentence3: Sure. I'd like a reservation for Tuesday. Sentence4: That will be all, thank you for your help. Sentence5: There are no cheap korean restaurants in the area, would you like to look up a different restaurant? Sentence6: Yes, I am also looking for a cheap hotel in the same area as the restaurant. Sentence7: I suppose. Is there a room available for 2 nights, starting Sunday? Sentence8: You are quite welcome. Have a pleasant stay. Sentence9: Yes it does have to be. Sentence10: Yes please book it for four people in the three nights starting on Sunday Sentence11: I found da vinci pizzeria would you like to book a table there? Sentence12: Ok, for how many and at what time? Sentence13: I'm looking for a cheap restaurant where I can get some korean food, please. Sentence14: 18:00. Also I need the address, postcode and phone number, please. Sentence15: I'm sorry, but there are no restaurants that match your criteria. Would you care to broaden your search a bit? Sentence16: I am sorry, but I was unable to book your request, would you be able to move the starting date or have a shorter stay? Sentence17: 20 Milton Road Chesterton, cb41jy, and 01223351707. Anything else? Sentence18: Booking was successful. Reference number is : TF5T6MYF .. Anything else? Sentence19: Does it have to be cheap and located in the north as well? Sentence20: What about a cheap korean restaurant in the north? Question: Who has spoken the sentence 18? (A) User (B) System
Output: 


Answer: (A) User