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: How many train tickets will you need? Sentence2: i'm leaving from peterborough on tuesday and the train should arrive after 15:30 Sentence3: I have a train that leaves at 15:48 and arrives at 16:38. Would that work for you? Sentence4: Just the one, please. Sentence5: Oh, yes, I meant I need to leave after 15:30. I guess that means it will arrive after 15:30, too, ha ha. Sentence6: Can we book the hotel for 1 person and 5 nights starting from Tuesday? Sentence7: The price is 16.50 pounds. Sentence8: You're welcome. Have a nice trip and stay. Goodbye. Sentence9: Please book that train. I'm also in search of a particular hotel. It's called Worth House. Sentence10: I was able to successfully book you at Worth House for 5 nights starting Tuesday. Your reference number is H38MB0WZ . Sentence11: You're very welcome. Have a great trip! Sentence12: Thank you so much that is everything that I need. Sentence13: OK, your train ticket is booked (Ref#WYJFK3C4). As far as the Worth House goes, it's a cheap, 4-star guesthouse on the north side of town. Sentence14: Yes, of course. Where would you like to leave from and when would you like to leave? Sentence15: Thank you! You've been very helpful. I will be sure to ask for you if I need anything else on our trip. Sentence16: Yes. What is the price on that? Sentence17: Just to confirm, did you want to leave after 15:30 or arrive by 15:30? Sentence18: I want to take a trip to Cambridge, but need some help locating a train. Can you provide some information for me please? Question: Who has spoken the sentence 12? (A) User (B) System
Output: 


Answer: (A) User