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 please book the restaurant for me. Sentence2: Booking was unsuccessful. Would you like to book another day or a shorter day? Sentence3: I have successfully booked you a taxi! You will be driven in a Black Toyota and the contact number is 07914565807. Can I help you with anything else? Sentence4: There are a few hotels that meet your criteria. Would you be interested in the Alexander Bed and Breakfast? It has four stars with cheap prices. Sentence5: The booking was successful at the University Arms Hotel. Your reference number is: E7AK16IK . Would you like the phone number? Sentence6: There are 2 hotels in the expensive price range. One has 3 stars and one has 4 stars. Sentence7: No, that's all I need. Thank you for your help! Sentence8: I also need a restaurant the restaurant should be in the expensive price range and serve north american food. Sentence9: The hotel should be in the expensive price range. Sentence10: Please try to book a 1 night stay. Sentence11: I changed my mind. I will go ahead and book it myself. But, can you please provide me the address and postcode. Thanks. Sentence12: Could you book me a taxi please? I would like to leave the restuarant at 20:15 and go back to the hotel. Sentence13: The only result in your area meeting that criteria is Gourmet Burger Kitchen in centre. Would you like me to book a table for you? Sentence14: No problem. You have a good day now! Sentence15: Hello, are there any centrally located hotels in Cambridge with free parking? Sentence16: Gourmet Burger Kitchen is located at Regent Street City Centre, cb21ab. Can I help with anything else today? Sentence17: Not a problem. For what time and day will that be for? Sentence18: Let's go with the 4 star option. I'd like to book it for two people and three nights starting from thursday. Question: Who has spoken the sentence 15? (A) User (B) System
Output: 


Answer: (B) System