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: There is only one train traveling from Cambridge to Stevenage on Thursday close to 23:30. It is the TR8239, would you like for me to book you a ticket? Sentence2: Thank you for contacting Cambridge TownInfo centre. Goodbye! Sentence3: Thank you so much, no need for booking, that is all of my questions. Sentence4: I need a train from Cambridge to Stevenage please. Sentence5: Yes, please. I'll actually need 7 tickets. Sentence6: Perhaps with different criteria? I have nothing for 0 stars, expensive, in the centre. Sentence7: I'd like to leave on Tuesday after 21:30, please. Sentence8: How about cheap price range? Sentence9: I also need an expensive lodging in the center of town. Sentence10: I was able to reserve 7 tickets for you. Your total fee is 89.6 GBP and your reference number is BRQC79TR . Do you need anything else? Sentence11: Okay, once you've found a hotel, could you give me the hotel type, post code and whether or not they have free parking? Sentence12: Hmm, I was really looking for something with 0 stars. Can you check for any guesthouses instead? Sentence13: I have 4 trains for those locations. What day and time were you looking for? Sentence14: I'm still looking, please stand by. Sentence15: The el shaddai is a guesthouse with free parking. The postcode is cb11eg. Sentence16: I found 2 hotels, the gonville hotel, 3 stars, and the university arms hotel, 4 stars. Which do you prefer? Question: Who has spoken the sentence 12? (A) User (B) System
Output: 


Answer: (A) User