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 I am looking for an expensive restaurant in the centre of town. Sentence2: Okay, let's book a table for five on Wednesday at 14:45. Sentence3: So happy to help, and thanks for using Cambridge TownInfo service today! Sentence4: No 14:45 is the only time that works for all of us. Could you look for a different restaurant in the same area and price range for me? Sentence5: Can I recommend clowns cafe located on 54 King Street City Centre? Sentence6: I am looking for Italian food. Sentence7: Can I recommend don pasquale pizzeria located on 12 Market Hill City Centre? Sentence8: I was unable to book at 14:45, can I try another time for you? Sentence9: There are thirty-three results. Would you like a specific type of food? Sentence10: Sure and give me the reference number too please. Sentence11: Thank you so much for your time. That will be all. Sentence12: Okay I have booked you there and your reference number is O7FJ870G . Question: Who has spoken the sentence 11? (A) User (B) System
Output: 


Answer: (B) System