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: Hello there. I am trying to locate a train for Monday. Sentence2: Let me know if you do need any more help. Good bye. Sentence3: All right, and where would you like to depart from? Sentence4: I have two trains that will leave after 21:00. One leaves at 21:39 and one leaves at 23:39. Which would you prefer? Sentence5: I need on that will leave London after 21:00. Sentence6: Sure. Where will you be going? Sentence7: No I don't need to book it right now. Thanks for the information. Sentence8: The train ID is TR5906 and it arrives by 23:07 in Cambridge. Would you like me to book that one for you? Sentence9: Nope. Thanks though. Goodbye. Sentence10: I've got 10 trains that are on that route. Do you have a preferred departure or arrival time? Sentence11: I am going to Cambridge. Sentence12: I'll will be leaving from London Liverpool Street. Sentence13: What time does the one that leaves at 21:39 arrive in Cambridge? Also, what is the train ID? Sentence14: You're very welcome. Is there anything else I can help you with today? Question: Who has spoken the sentence 9? (A) User (B) System
Output: 


Answer: (B) System