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: Certainly. Two nights, three people, and I'll need that room starting Monday. Sentence2: The 4 matching restaurants are "hotel du vin and bistro," "galleria," "de luca cucina and bar," and "riverside brasserie." Sentence3: I'm looking for a restaurant in the center of town that serves european food. Sentence4: There are fourteen different options for your guesthouse. Is there a specific area you would like to be in? How about the star rating? Sentence5: Let's try for 15:30 and can I get a reference number please? Sentence6: Great! I also need a guesthouse with free wifi. Something moderately priced, and I don't care about parking. Sentence7: Let's go with acorn guest house. Unfortunately, that booking was unsuccessful. Want me to try something else? Sentence8: There are several that suit your needs. Any preferences on price range? Sentence9: I don't. Thanks so much. Sentence10: There seems to be an error. Can you please restate your preferred number of nights, the day you'll arrive, and the number in your party? Sentence11: Booking was unsuccessful. Would you like to book another day or time slot? Or perhaps another of the restaurant choices for the same booking information? Sentence12: Perfect! Can you please book a table for 3 people at Galleria for me on Monday at 16:30? Sentence13: You're welcome! You have a great day! Sentence14: Moderate price range, please. Sentence15: Great! Your booking was successful. The reference number is TWU9EM7U . Do you need help with anything else? Sentence16: Ok. That worked. It is booked and your reference number is QBVP0ZV2 . Sentence17: Instead of 3 nights how about two nights? Sentence18: I don't have any preference. Could you just pick something and book 5 nights for 3 people beginning on Monday? Question: Who has spoken the sentence 15? (A) User (B) System
Output: 


Answer: (B) System