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 about 8 trains going that route. The last train for that route arrives at 20:07. It leaves at 19:29. Would this arrival time work for you? Sentence2: Not a problem. What day will that be for? Sentence3: Okay great. Thank you very much. Sentence4: No thank you. Sentence5: Is there anything else I can help you with? Sentence6: I am sorry, I have no details for restaurants at your Bishops Stortford destination. Can I help you with anything else? Sentence7: Are you sure? If you know which area, (east, west, centre, etc...), or what type of food you're looking for, I would be happy to find you a restaurant. Sentence8: No, that's all. Thanks! Sentence9: I want to book a train that departs from Cambridge and arrives in Peterborough by 21:45. Sentence10: Yes, please book this for 4 people, please give me the reference number. Sentence11: I would like to book a restaurant for 4 people after I arrive. Sentence12: Ok. TR 4673 is booked for 4 people. The reference number is BY93GO28 . Sentence13: I would like to travel on Saturday., Cambridge to Bishops Stortford. Sentence14: You are welcome. Thank you for calling Cambridge TownInfo Centre. Goodbye. Question: Who has spoken the sentence 1? (A) User (B) System
Output: 


Answer: (B) System