You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: I think that is all for now! Thanks again. Have a great day! Sentence2: Can you try booking it for 11:15? Sentence3: I have pulled up 3. How about anatolia, they are moderately priced. Sentence4: Thank you. You've been very helpful. Sentence5: That works for me. Go ahead and book it. Sentence6: Can I have the reference number please? Sentence7: Yes, it's 105 minutes total. Would you like anything else? Sentence8: Done - your reference number is GJ3062PE . The total fee is 37.79 GPB which you can pay at the station. Sentence9: Sounds great. Can I get their location and phone number? Sentence10: Can you make a reservation for 6 people at 12:15 on wednesday? Sentence11: If you are leaving from cambridge I can book you on TR1755 leaving at 09:21 and arriving at 11:06. Will this work for you? Sentence12: I am craving Turkish food in the centre. Is there a restaurant available? Sentence13: You're welcome. You have a great day as well! Sentence14: I was able to fulfill your request. You are booked at Anatolia on Wednesday at 11:15. The reservation is for 6 people. How else may I help you? Sentence15: Sure thing! It is located at 30 Bridge Street City Centre and the phone number is 01223362372 Sentence16: Can I get the travel time in minutes please? Sentence17: Will there be anything else you need? Sentence18: Yes, please. I need a train to Leicester on Thursday, please. I need to get there by 16:15. Sentence19: I am so sorry nothing available for any of the turkish restaurants for that day & time slot. Something else perhaps? Sentence20: The reference number is G7THDK3O . Is there anything else I can help you with. Question: Who has spoken the sentence 19? (A) User (B) System
Output:
Answer: (B) System