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'll take whichever one you recommend. I just need the phone number, postcode & address please. Sentence2: TR7786 will leave at 17:00, would that work for you? Sentence3: The travel time is 51 minutes. Can I help you with anything else? Sentence4: What time would you like to depart. I have anything from 5:00 to 23:00 Sentence5: Hello, can you help me find a train going to London Kings Cross? Sentence6: You're very welcome! I hope that you enjoy your time here! Thank you for contacting the Cambridge TownInfo centre. Sentence7: There are 3 restaurants that match what you're looking for, would you like me to book one for you? Sentence8: I would recommend the Ghandi. They are located at 72 Regent Street City Centre and can be reached at 01223353942, can I assist with anything else? Sentence9: I think that's everything I need. Thank you very much. Sentence10: Can I get the travel time for that as well? Sentence11: On Monday, from Cambridge. Sentence12: Yes, I apologize but can you give me the arrival time for train TR7786? Sentence13: Yes, please. Is there a restaurant with Indian food? Sentence14: Sure I can. The arrival time for that train is 17:51. Is there anything else I can do for you? Sentence15: I'd like to leave after 15:45, please. Sentence16: I want a cheap swedish restaurant in the centre, please. Sentence17: Sure! What day are you planning on leaving? Sentence18: I wasn't able to find a cheap swedish restaurant in the centre of time. Would you like me to try a different type of food? Question: Who has spoken the sentence 17? (A) User (B) System
Output: 


Answer: (B) System