Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Could you recommend a restaurant that serves indian food is expensive, and in the centre? Sentence2: Sure thing, you have any particular attraction in mind? Sentence3: There are no restaurants that serve indian food? Sentence4: I'd suggest broughton house gallery on 98 king street, cb11ln. Anything else? Sentence5: No that is all. Thank you for your help. Goodbye. Sentence6: I am looking for an expensive place to dine that serves catalan food. Sentence7: Their phone number is 01223314960. Anything else? Sentence8: Yes, could you please give me their phone number? Sentence9: I am sure, would you like me to check for another option? Sentence10: Something in the centre of town. Do you have any suggestions for a museum maybe? Sentence11: Thanks, I'm also looking for a place to go in the same area. Sentence12: I'm sorry, a table isn't available. Perhaps a different day or time slot would work for you? Sentence13: I am sorry there are not Indian restaurants. Can I check for a Chinese restaurant? Sentence14: Sure. What time would you like the reservation for? Sentence15: I do not show any matches for your request, maybe change the type of food? Sentence16: Can you try 13:30 instead? Thanks. Sentence17: Are you sure? I really need an expensive restaurant that serves catalan food in the centre of the city. Can you check again please? Sentence18: I need a table for 2 people on Monday at 14:30. Sentence19: Booking was successful. The table will be reserved for 15 minutes. Reference number is : Z0V0H1YR . Sentence20: Sounds great! Can you set up a reservation? Sentence21: You are very welcome. Thank you for choosing Cambridge TownInfo centre today! Sentence22: I am afraid there is none. Sentence23: What type of restaurants are located in the city centre? Sentence24: I'm so sorry, I was mistaken, there are several expensive Indian restaurants in the centre of town. May I recommend Curry Queen, at 106 Mill Road? Question: Who has spoken the sentence 20? (A) User (B) System
Output:
Answer: (A) User