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 need to depart from Cambridge, leaving after 20:30 Sentence2: Okay! What would you like to know? Sentence3: No thank you! I just need the arrival time, travel time, and train ID. Sentence4: Yes I need a train that leaves on monday going to birmingham new street. Sentence5: There are three trains that depart after 20:30 The first one departs at 21:01. Would you like to book a seat? Sentence6: Thank you so much! Sentence7: First, I need a cheap guesthouse in the centre. It should have free WiFi. Sentence8: Is there anything else I can help you with? Sentence9: Great thank you Sentence10: No that's all thank you. Sentence11: There are trains every hour to birmingham new street. It takes 163 minutes. What time would you like to travel? Sentence12: I would prefer the 4 star rated one. I need to book it for 2 people for 4 nights starting friday. Sentence13: Can I help you with anything else? Sentence14: Yes I have two one is rated 4 stars and the other has a 0 star rating. Which do you prefer? Sentence15: I am looking for information in Cambridge Sentence16: Okay. Your booking at the Alexander Bed and Breakfast was successful. Your reference number is 7IL8SAJV . Sentence17: TR2392 arrives at 23:44. I travels for 163 minutes. Sentence18: You're welcome, have a great day! Question: Who has spoken the sentence 3? (A) User (B) System
Output: 


Answer: (B) System