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 want to book it for 1 people and 3 nights starting from tuesday. Sentence2: Not really, but I do need free parking in expensive range Sentence3: I have a number of guesthouses available, do you have a location preference? Sentence4: That's all, I'm gonna need. Thanks. Sentence5: alexander bed and breakfast would suit your needs. How many people will be staying and for how many days? Sentence6: what about the one with a cheap range? Sentence7: Let's go with the cheap place. It will be the same day, same people, and we'd like to dine at 14:15. Sentence8: Ok, your taxi will be a red lexus. Its contact number is 07558129121. Is there anything else I can help you with today? Sentence9: What's your price range? I recommend the Ugly Duckling, but it's expensive. Charlie Chan is a good, cheap place, and Lan Hong House is in the middle, price-wise. Sentence10: I have seven cheap 4 star guesthouses with free parking in the cheap range. One in the center, three in the east and one each in the north, south and west. Sentence11: Can you find me a guesthouse with a 4 star rating? Sentence12: Thank you for using our service today? Sentence13: I also would like to find a chinese restaurant in the centre. Sentence14: No thank you that will be all Sentence15: Reference number is : BL0Z1OXC . Anything else I can help with? Sentence16: I'm sorry, but we don't have anything that meets your requests. Would you like to change what you're looking for? Maybe I could help you with something else? Sentence17: Actually, I will need to book a taxi to commute between the hotel and restaurant. I want to arrive at the restaurant by the booked time. Sentence18: Can you recommend one? I need a reservation for tuesday Sentence19: Booking was successful and your table will be reserved for 15 minutes. The reference number is DJAKWB3Y . Is there anything else I can help you with? Sentence20: Thank you again for using our service, enjoy your stay! Question: Who has spoken the sentence 3? (A) User (B) System
Output: 


Answer: (B) System