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 would like 2 tickets please. Sentence2: That would be 19.6 GBP payable at the station. The reference number is 7XTP6M2A . Is there anything else I could help you with? Sentence3: Yes, there are a lot of options. Do you know what station you'd like to travel in to or out of? Sentence4: From Cambridge to Kings Lynn please. Sentence5: I have the places info here, what may I help you with? Sentence6: Thank you. That will be everything I need today. Sentence7: I need to book the hotel for 2 people for 2 nights starting on Saturday. Sentence8: You're welcome. Have a great day! Sentence9: TR3566 is the first train leaving cambridge to kings lynn on monday. it departs at 11:11 and arrives at 11:58. How amny tickets would you like to book? Sentence10: OK, thank you! I am also looking for a train for monday that leaves after 10:15, could you help me with that? Sentence11: Okay, you've been booked! Your reference number is GPU1Z9PM . Sentence12: Hi there. I'm looking for a particular hotel called the A and B Guest House. Question: Who has spoken the sentence 10? (A) User (B) System
Output: 


Answer: (A) User