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: cambridge. by 13:30 and should go to broxbourne Sentence2: No, but I'm looking for Corsican food. Sentence3: That was all thank you. Goodbye. Sentence4: Thank you for contacting us and have a nice day. Sentence5: I found 5 restaurants that serve European food all over Cambridge. I recommend the city stop restaurant on the North side. Would you like me to make a reservation for you? Sentence6: The area does not matter. But try European food please? Sentence7: Could you tell me your departure site and destination? Sentence8: No, just get me the Train ID. Sentence9: I apologize, but I could not find a Corsican restaurant meeting your criteria. Would you like to try a different food type? Sentence10: Help me find an expensive restaurant. Sentence11: I have many, what area were to looking to dine in? Sentence12: Ok, do you have a day of the week you want to travel? Sentence13: yeah i also need a train Sentence14: The train ID is TR 9605. Is there anything else you need? Sentence15: I need to travel on monday please. Sentence16: Yes can you check the same area for chinese food please? Sentence17: I have a table booked for 7 people on friday at 14:15, your reference number is JCTPEZT9 . Can I help with anything else? Sentence18: Okay. There are 10 trains matching your query. TR9605 departs at 14:01. Would you like to make a booking for that train or hear about other options? Sentence19: Yes please for 7 people at 14:15 on friday. Sentence20: I would be happy to assist you. Is there an area of town that interests you? Question: Who has spoken the sentence 10? (A) User (B) System
Output: 


Answer: (A) User