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: Sure. Your reference number is 6F6ZHY2Z . Is there anything else I can help you with? Sentence2: I am going to need a taxi to go between the two places. I need to arrive by my reservation time. Sentence3: No, not really. Just needs to be in the moderate price range. Sentence4: Hi, I am looking for a 4 star hotel to stay at. Free parking is not necessary. Sentence5: Here is a number for a reliable taxi Sentence6: I'd recommend the avalon hotel. Would you like to book a room? Sentence7: I am also looking for a resturant called Nandos City centre. Can you make a reservation there for 2 people at 17:00 on Saturday? Sentence8: Yes, I would. Can you book it for 2 people for 5 nights starting Saturday? Sentence9: I have several indifferent areas of town. Do you have a location preference? Sentence10: I successfully booked a room for 2 at the Avalon for 5 nights starting Saturday. Your reference number is D5ZO6ZH1 Sentence11: I would prefer to keep it in the moderate price range and I really need free WiFi as well, please. Sentence12: Okay I can help you with that. There are many options to choose from. What is your price range? Question: Who has spoken the sentence 1? (A) User (B) System
Output: 


Answer: (B) System