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 found three, one leaving at 21:40, 22:40, and 23:40 which would you like to go? Sentence2: I wish to go to New York City leaving this Friday. Sentence3: You're welcome - safe travels! Sentence4: How about Thai food? Sentence5: Unfortunately no table is available at that time do you have another time? Sentence6: What is your destination and day of travel? Sentence7: Alright, I have you booked at Sala Thong at 12:15. Reference number is: QIH3G407 . Can I help you with anything else? Sentence8: How many people will be dining? Sentence9: No, that should be everything. Thank you very much! Sentence10: I'm sorry, but I can't help you with travel outside of Cambridge and the surrounding areas. Sentence11: The one in the west works please. Can you pleas book it for me on the same day at about 13:15. Sentence12: I would like to book the 21:40 train on Wednesday for one person please. I also need a reference number please. Sentence13: Booking was successful, the total fee is 10.1 GBP payable at the station. Your reference number is : VJ3ZAO4F . Is there anything else I can help you with? Sentence14: I'll be dining alone. Sentence15: Could you please check for a table at 12:15 and can I have the reference number? Sentence16: Ok. How about a train to the Stansted airport? Sentence17: There are 2 restaurants that serve thai food; one in the west and one in the centre. Do you have a location preference? Sentence18: I cannot find any restaurant that serves north african food in the area. Sentence19: Yes, I am also looking to eat some north african food. Can you help me find a restaurant? Sentence20: I want to get a train out of Cambridge that departs after 20:45 please. Question: Who has spoken the sentence 16? (A) User (B) System
Output: 


Answer: (A) User