Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: I do not have anything. Can I try something else? Sentence2: there is no restaurant in that side of town serving your kind of food. can we change the cuisine? Sentence3: Okay. Thank you for calling. Sentence4: Can you check for asian oriental? I don't care what area it is in. Sentence5: Great, I just need the area and postcode please. Sentence6: Can you check for ones with a cheap price range? Sentence7: I'm also looking for a place to dine. The restaurant should serve Asian oriental food and should be in the same price range as the hotel. Sentence8: I'm looking for a 4 star hotel in the east. Sentence9: My mistake. There are three cheap guesthouses. The Allenbell, Autumn House, and Leverton House all offer free parking. Would you like to make a booking? Sentence10: Pick the most popular one, I need their phone number as well and hotel type. If they have area and postal code , I will need it. Sentence11: I was able to book your taxi per your request. It will be a black tesla and the contact number is 07433186357. Is there anything else today? Sentence12: I would like a taxi going to dojo noodle bar. I want to leave my hotel (Leverton House) by 07:30. Sentence13: Yes, all three of the guesthouses have free internet and free parking. Is there one that you would prefer? Sentence14: Are you saying that there isn't even a cheap 4 star guesthouse on the east side? What kind of city is this? Sentence15: That is all for now. Thank you for all your help. Sentence16: The area is not important. I just need it to be asian oriental food and something cheap. Sentence17: It is located in the centre and the postcode is CB21RQ. Sentence18: I can recommend dojo noodle bar in the centre. Sentence19: With those requirements, I do have one hotel in the east. It is expensive 2 star rated with both free parking and wifi. It is the Express by Holiday Inn Cambridge. Sentence20: In that case, how about just a hotel in the east that has free parking? Sentence21: I dont have any in the east. can I check another location? Sentence22: There are no cheap four star hotels in the area. Another criteria maybe? Sentence23: I am sorry I have no cheap 4 star hotels, maybe a more realistic star rating? Sentence24: How about Chinese in the east? It should still be in the same price range as the hotel. Sentence25: Oh man, I can't do expensive. Is there a 4 star guesthouse that is cheap in the east perhaps? Sentence26: My system is not pulling up any 4 star hotels in East. Would you like to try a guesthouse or another area perhaps? Sentence27: Leverton House is lovely. It's a guesthouse in the centre of town. The phone number is 01223292094, and the postcode is cb58rs. Would you like me to book that? Sentence28: I think you need to pay more attention, it's your job to be alert. Do they all have free internet? Question: Who has spoken the sentence 20? (A) User (B) System
Output:
Answer: (A) User