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: I booked it for you. The reference number is TCBE0PUQ . Sentence2: Booked! Your reference number is: 4T6UFRYC . Can I help with anything else? Sentence3: Thank you, goodbye Sentence4: Enjoy the rest of your day! Sentence5: it is a moderate restaurant in the west. can i book for you? Sentence6: Yeah, what can you tell me about a restaurant called Meghna? Sentence7: I am looking for a train from Stevanage to Cambridge. Sentence8: Eww, Friday won't really work for me. Do you have anything on Thursday? Sentence9: Yes, please. I'd like a reservation for 4 on Thursday at 20:30. Sentence10: I have several options. They all leave on Friday; do you have a preferred departure time? Sentence11: There are 10 trains traveling on Thursday. The first train leaves at 05:54. Do you want to book this train or do you want a later departure time? Sentence12: That train sounds good, can you book it for 4 people? Question: Who has spoken the sentence 3? (A) User (B) System
Output: 


Answer: (B) System