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: Yes, I would also like the reference number for the booking please. Sentence2: Okay, how many tickets would you like? Sentence3: I'm heading to Broxbourne. Sentence4: TR2125 leaves at 09:01 and arrives at 10:01. Would you like me to book that for you? Sentence5: Yes there are. What is your destination? Sentence6: No, I think I'm all set. Thank you very much for your help! Sentence7: We have trains leaving hourly from Cambridge to Broxbourne, starting at 5:01 for 17.90 pounds. What time would you like to leave? Sentence8: Have a great day! Sentence9: I need that for 6 people. Sentence10: Are there any trains leaving from Cambridge on Thursday? Sentence11: You have 6 tickets on TR125 leaving Thursday at 9:01. Reference number is PPP9YI7K . 107.4 GBP will be payable at the station. Can I help you further? Sentence12: I am looking for one that will arrive by 15:00 Question: Who has spoken the sentence 4? (A) User (B) System
Output: 


Answer: (A) User