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 will book that for you now. Sentence2: Okay. I have booked one ticket for you. The reference number is EHRSRM7K and it will cost 4.4 GBP. Sentence3: I can help you with that. How early do you want to leave because we have trains running as early as 5:35 Sentence4: Thank you for using our system! Sentence5: How many tickets will you need? Sentence6: No, that is all. Thank you so much. Goodbye Sentence7: i want to arrive by 16:30 if possible. Sentence8: I need to see some train times for Wednesday. Sentence9: The TR2211 will leave Ely Wednesday arriving at 15:52. Would you like to book that one? Sentence10: Thank you and I need a reference number Sentence11: Yes book that for me thank you Sentence12: I need to depart from ely and arrive by 16:30. Sentence13: There are 404 trains running on Wednesday, what point of departure and point of arrival are you interested in? Sentence14: Just one ticket and thank you Question: Who has spoken the sentence 13? (A) User (B) System
Output: 


Answer: (B) System