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: How about just one night instead? May I have the reference number please? Sentence2: Sunday. Could you please send me the reference number? Sentence3: Yes, I would like a guesthouse with a 0 star rating. Sentence4: El Shaddai sounds fine. I need to reserve it for two adults for two nights, please. Sentence5: There is city centre north b and b, and el shaddai which would you like to book? Sentence6: Sure, the 15:17 train's id is TR7931. Is there anything else I can help you with? Sentence7: I want to depart from london kings cross after 13:30. Sentence8: Sure, the first train leaves at 15:17. Would you like to book it? Sentence9: You are very welcome. Enjoy your stay! Sentence10: There are 200 trains coming to Cambridge on Sunday. Is there a particular time or departure location you're interested in? Sentence11: Great, that was a successful booking, the reference number is 9H97D0MB . Is there anything else I can help with? Sentence12: No that's all, thanks! Sentence13: I am also looking for a place to stay. I would like the hotel to have free parking and free wifi. Sentence14: I'm looking for a train leaving on Sunday that is going to Cambridge. Sentence15: Alright, what day will you be staying? Sentence16: No, I would like to book at a later time, but can I please get the train ID? Sentence17: My listings show almost 30 separate lodgings around town with free wifi and parking! Do you have any other preferences to help me pick one for you? Sentence18: Unfortunately the booking was unsuccessful. Would you like me to book it for another day or duration? Question: Who has spoken the sentence 4? (A) User (B) System
Output: 


Answer: (A) User