Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: The only restaurant that fits that criteria is the missing sock. Can I try a different reservation time for you? Sentence2: Of course, would a guesthouse be OK? Sentence3: carolina bed and breakfast is in the east part of town. How many people should i book for Sentence4: I do apologize, but that is the only international restaurant in the area. Perhaps pick another cuisine type? Sentence5: Yes, in the east part of town The Missing Sock serves international food and their prices are quite low. Shall I book you a table? Sentence6: Can you help me find a german restaurant in the east please? Sentence7: Unfortunately, that time is also unavailable. Sentence8: Can you find me something cheap? Sentence9: There is one restaurant for international on the east side the missing sock, I attempted booking but it was unsuccessful. Can we try another time for booking? Sentence10: That restaurant will be fine, lets book it. Sentence11: Okay, but given the mistake regarding the area of town, could you check again for a table for 1 at a cheap international restaurant on the east side? Sentence12: The Italian restaurant is called La Margherita. What day would you like a reservation? Sentence13: You know what, I've changed my mind. I'd prefer international to Italian. Are there any like that in the east part of town? Sentence14: I guess a reservation at 15:30 would be alright. Do you have any? Sentence15: I've found two in that area that fit that criteria. An Italian restaurant and a Vietnamese restaurant. Which of those would you prefer? Sentence16: I need a restaurant serving International Food in the East Thursday at 15:15 for one person. Can you do that for me? Sentence17: You stated earlier there was no German restaurant in the west, but I was looking for one in the east. Sentence18: That too was unsuccessful. Maybe you'd like to try for another day? Sentence19: My apologies about the miscommunication. There is no German restaurant in the east area. Sentence20: Perfect, your booking was successful, the reference number is T5BJ4XD0 . Is there anything else that I can help you with? Sentence21: I am sorry but that time is not available to book. Would you like to try another time? Sentence22: Is there a way you can contact the restaurant and try the booking again for 15:15 on Thursday for 1 person? Sentence23: Can you try again to book The Missing Sock for 1 person at 15:15? Sentence24: That sounds good. Could I get a reservation on thursday at 15:15 for 1 with a reference number? Also looking for a place to stay in the area with free parking Sentence25: I am sorry, that still does not work, any other time you could do? Sentence26: I did not find any german restaurant in the west. would you like to change location/food type? Sentence27: I prefer the Italian but will go to the Vietnamese if the booking does not work. Sentence28: Yes, as long as it is in the same general area and price range as The Missing Sock restaurant. Sentence29: Thanks! I need a hotel on the east side, please. Sentence30: Perhaps another restaurant in the east that serves International food and can be booked at that time? Question: Who has spoken the sentence 20? (A) User (B) System
A:
Answer: (A) User