Teacher:You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Teacher: Now, understand the problem? Solve this instance: Sentence1: Certainly. Two nights, three people, and I'll need that room starting Monday. Sentence2: The 4 matching restaurants are "hotel du vin and bistro," "galleria," "de luca cucina and bar," and "riverside brasserie." Sentence3: I'm looking for a restaurant in the center of town that serves european food. Sentence4: There are fourteen different options for your guesthouse. Is there a specific area you would like to be in? How about the star rating? Sentence5: Let's try for 15:30 and can I get a reference number please? Sentence6: Great! I also need a guesthouse with free wifi. Something moderately priced, and I don't care about parking. Sentence7: Let's go with acorn guest house. Unfortunately, that booking was unsuccessful. Want me to try something else? Sentence8: There are several that suit your needs. Any preferences on price range? Sentence9: I don't. Thanks so much. Sentence10: There seems to be an error. Can you please restate your preferred number of nights, the day you'll arrive, and the number in your party? Sentence11: Booking was unsuccessful. Would you like to book another day or time slot? Or perhaps another of the restaurant choices for the same booking information? Sentence12: Perfect! Can you please book a table for 3 people at Galleria for me on Monday at 16:30? Sentence13: You're welcome! You have a great day! Sentence14: Moderate price range, please. Sentence15: Great! Your booking was successful. The reference number is TWU9EM7U . Do you need help with anything else? Sentence16: Ok. That worked. It is booked and your reference number is QBVP0ZV2 . Sentence17: Instead of 3 nights how about two nights? Sentence18: I don't have any preference. Could you just pick something and book 5 nights for 3 people beginning on Monday? Question: Who has spoken the sentence 15? (A) User (B) System
Student:
Answer: (B) System