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: That's okay. No need to book now. But can I get the travel time for that train? Sentence2: There are a number of trains to choose from. What time would you like to depart? Sentence3: What is the earliest departing train and the price of a ticket for it? Sentence4: Departure time is flexible but I would need to get into Cambridge by 21:30. Sentence5: There are 15 trains that arrive by 21:30. Each train takes 1 hour. When would you prefer to depart? Sentence6: Okay, thanks! that's all I needed! Have a good day! Sentence7: The earliest train departs at 05:32 and is 17.90 pounds. Would you like a ticket? Sentence8: I am looking for a train on Wednesday departing form broxbourne Sentence9: I'm heading into Cambridge. Sentence10: The travel time for the train is 60 minutes. Sentence11: There are many results. Where is your destination? Sentence12: Glad I could help! Question: Who has spoken the sentence 2? (A) User (B) System
Output: 


Answer: (A) User