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: Hi there, I am looking for a train going to Cambridge, and departing from London liverpool street. Can you book me one? Sentence2: Thank you for using our system today! Sentence3: No, I don't need it booked right now. I would really like to find a college to visit in town. Sentence4: Thank you for that information, you've been very helpful. I will call back when I'm ready to book the train. Goodbye. Sentence5: Absolutely. The travel time is 88 minutes for that route. Would you like me to book a ticket for you? Sentence6: Yes. Could you tell me what the entrance fee is? Sentence7: The first train after 17:45 from London Liverpool Street to Cambridge leaves at 19:39 and arrives at 21:07. Would that be to your liking? Sentence8: Absolutely. Can you please tell me what day you would like the booking to be made for? Sentence9: The entrance fee is 2.50 pounds. Is there anything else I can help you with? Sentence10: That would work, could you tell me the travel time for that as well? Sentence11: I have many colleges but I could recommend clare hall. It is on the west side. Would you like more information on one? Sentence12: I'll be traveling on Saturday, please. Oh and I don't want to leave too early, let's say something after 17:45. Question: Who has spoken the sentence 11? (A) User (B) System
Output: 


Answer: (B) System