Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: I'm sorry, neither hotel is available for that booking. Would you like me to try a different day or shorter stay? Sentence2: No, it just seems as though our system is experiencing an error. Can you please restate your restaurant requirements? Sentence3: What do you mean? Do you have another suggestion? Sentence4: Thank you. Do I need a reservation number for the taxi? Sentence5: The Oak Bistro for 5 people on Sunday at 16:45. Also I am looking for a 3 star hotel in the expensive price range with free parking. Sentence6: You're booked at the Oak Bistro (Ref #QUJHQIMG). There are two hotels available: one in centre and one in south. Do you have a preference? Sentence7: What type of food does the Oak Bistro in Cambridge serve? Sentence8: Thanks. I'll also need a taxi from the hotel to the restaurant. I need to make sure I get there by the 16:45 reservation. Sentence9: Could I get the contact number and type of car for the taxi please. Sentence10: The Oak Bistro serves British food. Would you like to book there? Sentence11: No preference as long as it has 3 star, expensive price range, and free parking. I need it booked for 5 people for 5 nights starting Sunday. Sentence12: Are you sure this is the location you are looking for? Sentence13: Great your reference number is DK2CZK2P . Sentence14: No problem, you have a lovely day! Sentence15: Thank you so much for your help today. Sentence16: Yes, please book a table for 5 on Saturday at 16:45. May I get the reference number for that once you've booked it please? Sentence17: Is it available for 2 nights then? Sentence18: I almost forgot; I need the hotel name, LOL. Sentence19: The car is a yellow tesla. Contact number: 07951091729 Sentence20: I have booked your taxi as well. Is there anything else I can do for you today? Sentence21: No you do not need a reservation number for the taxi. Is there anything else I can help you with? Sentence22: Of course! Your reservation is at the Gonville Hotel. Question: Who has spoken the sentence 19? (A) User (B) System
Output:
Answer: (B) System