Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: What day do you want to travel? Sentence2: Yes, for 7 people. We want to check in on Friday and stay for two nights. Sentence3: No, I'm flexible on the area but I would really like them to offer both free parking and free wifi. Sentence4: Booking was successful, the total fee is 123.2 GBP payable at the station . Reference number is : 09J2HO3T . Is there anything more I can assist you with? Sentence5: We do have TR8151 that leaves Norwich at 12:16 and arrives in Cambridge at 13:35. Would this work for you? Sentence6: I couldn't get you that length of stay at the Acorn. Would you like to try a shorter stay or a different guesthouse? Sentence7: Thank you kind person for helping me! Sentence8: The same day as my hotel booking, please. Sentence9: No, that will be all, thank you. Sentence10: Yes, that's perfect. Please book for the same day, Friday, and the same number of people, 7. Sentence11: I am looking for a guesthouse in Cambridge in a moderate price range. Can you help? Sentence12: How about 1 night? Sentence13: I also need a train leaving from norwich arriving at in Cambride by 13:45 Sentence14: Thanks for using our system! Sentence15: I am sorry but there are no trains available at that time. Would you like to try another day or time? Sentence16: Do you need anything else? Sentence17: Yes, there are several guest houses available, do you have a specific area you'd like to stay at? Sentence18: They were able to accommodate you for one night. Your reference number is PG2V8WLA . Sentence19: I would definitely recommend the acorn guest house. Would you like a reservation? Sentence20: Yes please. Please recommend my best option. An earlier time would be fine. Question: Who has spoken the sentence 19? (A) User (B) System
Output:
Answer: (B) System