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'm sorry, there aren't any German restaurants in the centre, would you like me to expand the search to other parts of town? Sentence2: you're welcome, goodbye! Sentence3: There are 5 trains that will get to Cambridge by 10:30. The earliest departs Kings Lynn at 05:11. The latest one leaves at 09:11. Sentence4: Yes, there is. What's your price range? Sentence5: The 9:11 one is cool. I need to book for 7 people. Can I make sure to get the reference number? Sentence6: Expensive price range and I need a table for 7 at 13:00 on Thursday and the reference number. Sentence7: and what time do you need to leave? Sentence8: I will be leaving from kings Lynn. Sentence9: your all set reference # is 79REVFJ1 . anything else today? Sentence10: Thank you, thats all i needed. Sentence11: Ok great. Where will you be departing from? Sentence12: Yes I'm looking for a train to Cambridge that same day. Sentence13: I haven't had German food in ages so please find me a place in the centre that serves it Sentence14: Sure, but please make sure there aren't any in the centre again too. Sentence15: I just need to arrive by 10:30. Sentence16: Booking was successful, the total fee is 68.6 GBP payable at the station . Reference number is : H6VTWBV8 . What else can I do for you today? Sentence17: is there one that serves italian food? Sentence18: Goodbye and have a great day. Sentence19: There aren't any options for German food for any area, I'm afraid. Would you like to try a different type of food? Sentence20: thanks for inquiring with us. Question: Who has spoken the sentence 15? (A) User (B) System
Output: 


Answer: (B) System