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: There is one leaving at 21:29 and arriving at 22:07, TR4863. Would you like me to book it? Sentence2: Yes. The address is 20 Milton Road, Chesterton. So that I can reserve a table, how many will be in your party? Sentence3: One in my party. I'm also looking for a train to get to bishops stortford, can you help me with that too? Sentence4: What day and time would you like travel? Sentence5: Yes, I found one located in the centre of town called The River Bar Steakhouse and Grill. Would you like more information? Sentence6: I would like to leave Wednesday after 20:00. Sentence7: I don't need a reservation for the restaurant. I need to find a train from cambridge to bishops stortford. Sentence8: Thank you for contacting Cambridge TownInfo centre. I hope you have a pleasant trip! Goodbye! Sentence9: Hello are there any cheap European restaurants in town? Sentence10: Is there a time you would like to arrive by? Sentence11: Is there anything in the north part of town? Sentence12: Yes I would like to reserve a table there. May I have the address please? Sentence13: Can you look for Italian food instead? Sentence14: What time would you like your reservation to be? Sentence15: I'd be happy to reserve your table; what day and time will you be dining? Sentence16: Nothing of that criteria in the area. Shall I try again with another criteria? Sentence17: I will be leaving cambridge on wednesday after 20:00 to bishops stortford. Sentence18: No, I got all that I need. Goodbye. Sentence19: No. Please send me the Train ID and arrival time. Sentence20: I have the Da Vinci Pizzeria in the north. It is a cheap restaurant. Can I reserve you a table? Question: Who has spoken the sentence 12? (A) User (B) System
Output: 


Answer: (A) User