Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Certainly. The post code is cb2311 Sentence2: I have three places, would you prefer it still be cheap or would expensive work as well? Sentence3: No, I think that covers it all. Thanks so much for your help. Sentence4: I also need a place to stay in the centre. 1 star, please. Sentence5: We don't have any of those unfortunately. Would you like to try another type of cuisine? Sentence6: I need to find a cheap place to eat in Cambridge. Sentence7: Great! You're booked with a black tesla and the contact number is 07413441845. Is there anything else I can help you with? Sentence8: I have lots of options for you. Do you prefer a certain area or type of food? Sentence9: Yes, please book me for one person. Do they have internet and what is their phone number? Sentence10: That would be the gardenia, at 2 Rose Crescent City Centre. Would you like me to make a reservation? Sentence11: Cheap world food, please. Sentence12: Can you give me the postcode, please? Sentence13: How about any with 4 stars? Sentence14: I do not need the hotel booked, but I do need to schedule a taxi to take me from the hotel to the restaurant. Sentence15: You're welcome. Have a great day! Goodbye. Sentence16: Okay, when would you like to arrive by? Sentence17: I would like to leave the hotel by 02:45. Sentence18: Yeah, how about a Mediterranean restaurant in the centre of town? Sentence19: I don't have any 1 star hotels but I have a 0 star hotel called El Shaddai in the Centre. Would you like me to book it for you? Sentence20: Alexander bed and breakfast is a cheap 4 star guesthouse in the centre. Will that be okay? Sentence21: Thank you. Have a great day! Sentence22: You are very welcome! I hope you enjoy your trip and you can always let us know if you need any more assistance. Sentence23: Yes, they offer free internet and parking. Their phone number is 01223525725. In order to book that for you, can you tell me what day you want to start your stay? Sentence24: I would still like cheap please. Question: Who has spoken the sentence 17? (A) User (B) System
A:
Answer: (B) System