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: No, that's all. Thank you. Sentence2: I am looking for a place serving christmas food in the centre of town. Sentence3: I sure can. The address is Corn Exchange Street, and the phone number is 01223308871. Can I help you with anything else today? Sentence4: Are there any other options for gastropub? Sentence5: Yes, we have nine Indian restaurants in the center of town. Do you have a preference in price range? Sentence6: Do you have any Indian restaurants? Sentence7: In that case, could you give me the address and phone number? Sentence8: The Cow Pizza Kitchen and Bar is the only gastropub in all of Cambridge. Sentence9: The Cow Pizza Kitchen and Bar would be perfect for you! Would you like for me to book you a table? Sentence10: It doesn't look like there are any restaurants of that type. Would you like to try a different cuisine? Sentence11: Thank you for calling us today. Goodbye. Sentence12: I actually would prefer gastropub type food and preferably in the moderate price range. Question: Who has spoken the sentence 9? (A) User (B) System
Output: 


Answer: (B) System