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: I have successfully booked you at the acorn guest house for 3 nights starting on Friday. Your reference number is Z6DIM0YM . Is there anything else I can help with? Sentence2: Where will you be departing from? I have a number of trains to choose from. What time would you like to leave? Sentence3: I'm looking for a train going to Cambridge on Friday. Sentence4: We have eight 4 star guesthouses on the north side. Do you have a specific price range or do you need certain amenities? Sentence5: Thank you for contacting the Cambridge TownInfo centre. Goodbye Sentence6: No, thank you. I'll call back when I'm ready to book. Thank you so much for your help. Sentence7: Sounds good. I need it for 3 nights starting Friday. There are 6 of us. Sentence8: I will be departing from Norwich and should arrive by 16:30. Sentence9: It costs 17.60 pounds per ticket. Would you like to book this? Sentence10: What area are you looking to stay in? Sentence11: TR4828 departs at 14:16 and arrives by 15:35. Would you like a ticket? Sentence12: Okay I could recommend the Acorn Guest House that is moderately priced and rated 4 stars. Would you like a booking? Sentence13: I'm looking to stay in the north please. Sentence14: I need a place to stay with 4 stars. Sentence15: how much will that train cost me? Sentence16: any can do as long it has a moderate price range Question: Who has spoken the sentence 6? (A) User (B) System
Output: 


Answer: (A) User