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: yes book it for 4 people Sentence2: Yes sure. I have a reference number for you and it is 33TISTQB . Sentence3: Om I have train id TR1791 that fits your needs. Shall I book it ? Sentence4: Train TR1791 will leave at 17:00 on Thursday. It will cost 94.4GBP. Your reference number is HN91KJWK . Have your luggage ready, thank you! Sentence5: Is there a certain type of cuisine or part of town you're looking for? There are 22 restaurants to choose from. Sentence6: anytime after 17:00 on thursday going to london kings cross Sentence7: Thank you! Have a great day! Sentence8: I am traveling to Cambridge and looking forward to try local restaurants. Sentence9: I am departing from cambridge and want to arrive in london kings cross. Sentence10: Yeah. I'd like a moderately priced tuscan food restaurant. Sentence11: Thank, that is everything i need, you were so helpful. Sentence12: Thanks so much. Can you help me find a train? Sentence13: We have 5 different train times for you all on Friday. What time would you like to leave? Sentence14: Just so I can narrow down the results and get you exactly what you need, what's your departure station? Sentence15: I'm sorry there's no matching results. Sentence16: Great can you book that for 4 people at 17:45 on sunday? Sentence17: Okay, can we try modern European food instead, please? Sentence18: How about Galleria at 33 Bridge Street in the town centre. Great food. Question: Who has spoken the sentence 15? (A) User (B) System
Output: 


Answer: (B) System