Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: Do you see a Chinese restaurant in the same area as the hotel? Sentence2: I've found the rosa's bed and breakfast which is a cheap guesthouse in the South. Would that work for you? Sentence3: Yes how about for 16:45? Sentence4: They're located at 53 Roseford Road in postcode cb22ha. And yes, they do offer free parking. Sentence5: Yes for 7 people for 17:45 on a Monday. Sentence6: I'm sorry, that booking was unsuccessful, too. Would you like to try another time? Sentence7: Can we make the reservation an hour later? Sentence8: No, you have been very helpful thank you. Sentence9: We have one restaurant that matches your needs, it's The Missing Rock in the east area. Would you like me to book for you? Sentence10: Your best choice would be The Lucky Star, which is on Cambridge Leisure Park. Would you like to make a reservation? Sentence11: I'm looking for a hotel in the south, and I'd like cheaper options please. Sentence12: There are going to be a lot of us, so something cheap would be best. Sentence13: Great. Do they also offer free wifi? Sentence14: I am also looking for international food that is in the cheaper price range. Sentence15: No thank you- please just give me the address and phone number. Sentence16: The address is Finders Corner Newmarket Road, and the phone number is 01223812660. Sentence17: They sure do. Would you like to make a reservation? Sentence18: Sure! I have three options for Chinese food in the south with both cheap and expensive price ranges. What price range did you want for this restaurant? Sentence19: No, that's ok. Could you just give me the address and postcode and please let me know if they have free parking? Sentence20: Let us know if we may help further. Thank you, good bye. Sentence21: Does it have a star of 4? Sentence22: I apologize but I was unable to book your party for that time. Would you like to try a different time slot or a different day? Sentence23: Yes it does. Sentence24: I have your table booked. The reference number is : GI0NB9LA . Is there anything else I can help you with? Question: Who has spoken the sentence 20? (A) User (B) System
A:
Answer: (A) User