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: And what is your destination station? Sentence2: Gladly. It's located in the centre and it serves modern European food. Would you like me to make a reservation for you? Sentence3: Yes please, can I get a reservation for Friday at 21:00 for 3 people? Sentence4: I am also looking for de luca cucina and bar, can you help me locate it? Sentence5: I need to arrive by 5pm. Sentence6: I need a train that leaves london kings cross on friday Sentence7: I'm happy we could be of service, and enjoy your time in Cambridge! Sentence8: No thank you, that is everything. Sentence9: That's physically impossible. You want to leave after 17:30 which is 5:30 pm and arrive at 5 pm? Try that again please. Sentence10: There are 3 trains leaving after 17:30 on Friday, by what time would you like to arrive in Cambridge? Sentence11: the TR9139 leaves at 19:17 and arrives by 20:08 Sentence12: I need to arrive at Cambridge. I want the train to leave after 17:30. Sentence13: Great choice! Your booking was successful. Here is your reference number 8W4EZQ1E . Anything else I can help you with? Sentence14: Can I get the train ID and arrival time for the first train after 17:30 on Friday, going from Kings Cross to Cambridge? Question: Who has spoken the sentence 11? (A) User (B) System
Output: 


Answer: (B) System