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: TR5767 leaves at 05:00 should i book it for you? Sentence2: Yes. I am also looking for a place to stay in the south of town. Are there any guesthouses there? Sentence3: Yes, I need some train information. Looking to depart cambridge and arrive by 08:45. Sentence4: No, but I have 3 others that do. Would you like me to book one? Sentence5: No not today. I think that is everything I need. Thank you. Sentence6: I booked a seat on TR3225 with reference number 0KARLG2E . The fee is 75.09 payable at the station. Can I be of further help to you today? Sentence7: Thank you again for using our service. Good day ma'am. Sentence8: I have three guesthouse located in the south. Did you have a price range in mind? Sentence9: Yes please. I will need a ticket for one and the reference number. Sentence10: Rosa's bed and breakfast is cheap, 4 stars, located in the south, and includes internet and parking! Would you like me to book? Sentence11: No, thank you. Does that leave on Tuesday and go to birmingham new street? Sentence12: I would prefer something on the cheaper side. Question: Who has spoken the sentence 5? (A) User (B) System
Output: 


Answer: (B) System