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: Of course! Your reference number is J4Y78RXR . May I help with anything else? Sentence2: I am leaving from Cambridge and going to Birmingham New Street. I would also like to leave after 21:00. Sentence3: I have 13 colleges. I like the emmanuel college but is there another one you had in mind? Sentence4: I would like to see a college in the centre area of town. Sentence5: Of course! So that I can better help you, can you give me the departure and destination cities you are considering? Sentence6: I have TR1012, leaving at 21:01 and arriving at 23:44. Will that work for you? Sentence7: Nope. Thank you for your help! Sentence8: Emmanuel college is on saint andrew's street. It is free admission. Can I help you with anything else today? Sentence9: It sure will if you can book 8 tickets for me. Sentence10: Yes please, can you help me with train schedules too? I need to travel on Sunday. Sentence11: Okay, have a great day! Sentence12: Can I get the reference number for the train please? Sentence13: Emmanuel college is fine. What's the address? Sentence14: Your booking was successful and your fee is 480.64 GBP. Can I help you with anything else today? Question: Who has spoken the sentence 5? (A) User (B) System
Output: 


Answer: (B) System