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 have plenty of trains, can i get more information please? Sentence2: What's the postcode for your favorite one? Sentence3: No, thank you. You've been very helpful! Goodbye. Sentence4: I need to leave on sunday after 12:30 from cambridge to stevenage Sentence5: I've booked two tickets for the TR0523 train, and your reference number is R6GCVVA0 . Can I help you with anything else today? Sentence6: There are 44 different things to do in the centre of Cambridge. Can you help me narrow it down by type of activity or attraction? Sentence7: I also need to book a train. Sentence8: My personal favorite is holy trinity church. They are on market st and the postcode is cb23nz. Anything else I can help you with today? Sentence9: I'm looking for places to go in the centre of Cambridge. Sentence10: Great, can I get two tickets on it, please? Sentence11: Thank you for contacting Cambridge TownInfo centre. I hope you have a pleasant trip! Goodbye! Sentence12: The first train after 12:30 is the TR0523, which leaves Cambridge at 13:21. Question: Who has spoken the sentence 11? (A) User (B) System
Output: 


Answer: (B) System