Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: There are 6 four-star guesthouses in the east. Do you need free parking or Internet? Sentence2: You're welcome. Have a great day! Sentence3: There are 5 options available to you meeting that critera. Are you looking for a specific price range? Sentence4: Certainly! We have numbers of hotels. Any particular area or price range are you looking for? Sentence5: I do not have that information at the moment. Sentence6: Is there anything else I can assist you with today? Sentence7: Ok sorry I will call back when I have that information. Sentence8: TR5941 is good. Thank you for your help. Sentence9: TR5941 leaves at 21:00 and arrives at 21:51. TR6595 leaves at 23:00 and arrives by 23:51. Which do you prefer? Sentence10: Unfortunately I will need this information in order to book the room. Would like to call back at another time when you have that information? Sentence11: Excellent. That's all I will need. Sentence12: Yes can I have the address and hotel type for one of hotels? I'd take whichever one that you recommend. Sentence13: Great. Glad to help. Have a wonderful day! Sentence14: There are more than 2800 trains that leave on Tuesday and arrive before 20:00. What are your departure and destination points? Sentence15: I need a train after 20:00 on Tuesday, please. Sentence16: I have chosen the Warkworth House for you! It has parking along with internet capabilities. The address is 138 Perne Road. Sentence17: Wait. I also need a place to stay. Sentence18: Something moderately priced would be best. Sentence19: Of course. I'd like to leave from Cambridge and head to London King's Cross. Sentence20: I have 2 that I can try booking for you. How many in your party and how long is your stay going to be? Sentence21: I would like free parking. Sentence22: I prefer something in the east. And I only like to stay at 4-star rated places. Question: Who has spoken the sentence 20? (A) User (B) System
A:
Answer: (A) User