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: It is located in the centre. The postcode is cb23na. Sentence2: That will be all, thank you very much for your help! Sentence3: Sure, thank you! Will you please book a table for 4 people at 19:00 on Friday? Sentence4: Most of the nightclubs are in the centre area. Ballare is located at Heidelberg Gardens in Lion Yard. Would like to hear about some others? Sentence5: You have four options. Do you have an area preference? Sentence6: Booking was successful. The table will be reserved for 15 minutes. Reference number is : TLAT8P6I . What else can I do for you today? Sentence7: How about Charlie Chan? I eat there sometimes. Sentence8: Glad to have been of help. Thank you for using the Cambridge TownInfo centre. Have a great day. Sentence9: No, but could you tell me more about that one? is it in the centre? What's the postcode? Sentence10: I would like it to be in the centre. Sentence11: I'm also looking for a restaurant that serves cheap chinese food. Sentence12: I'm looking for a nightclub to visit. Question: Who has spoken the sentence 1? (A) User (B) System
Output: 


Answer: (B) System