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: Hello! Are there any cheap restaurants in the centre? Sentence2: Thank you. That'll be all! Sentence3: I would need 6 tickets please and the reference number. Sentence4: I can help you with that. What is the date and time you need to travel? Sentence5: What time would you like to book and for how many people? Sentence6: The total fee is 48.48 GBP and is payable at the station. The reference number is J1U2HA9U . Sentence7: I can get you on one at 8:40. Would you like me to book it? Sentence8: There are 15! Are you looking for a particular type of cuisine? Sentence9: 16:00 on Friday please for 6 people. Sentence10: No just one that I can book for friday would be good. Sentence11: Your reference number is AZ5ZZKQ0 . Sentence12: zizzi cambridge is an italian restaurant in the centre, shall I book? Sentence13: Thank you, I also am looking for a train that goes from cambridge to stansted airport Sentence14: Thank you for using Cambridge TownInfo centre. Please consider us for your future travel needs. Sentence15: Yes, please. For 6 people. Sentence16: I can book you on TR5580 which will leave cambridge at 08:40 and arrive at stansted airport b 09:08. How many shall I book it for? Sentence17: Yes, can I also get the reference number? Sentence18: I need to arrive by 09:45 Saturday. Question: Who has spoken the sentence 9? (A) User (B) System
Output: 


Answer: (B) System