You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Yes, I need some information about a restaurant called pizza express. Sentence2: Great I also need a taxi that will get me from the pool to the restaurant by 17:00. Sentence3: Kings Hedges sounds good, what postcode are they in? And do they have an entrance fee? Sentence4: Great that was all I needed today, thank you! Sentence5: The booking was not successful. Would you like to try another day/time? Sentence6: Were you looking for a booking at Pizza Express or Pizza Express Fen Ditton? They are both in the centre of town. Sentence7: Certainly! What information specifically are you looking for? Sentence8: I was able to book that taxi for you. Be looking for a red Toyota. If you need to reach them, please contact 07360365370. Is there anything else? Sentence9: Thank you for using our service. Have a wonderful evening. Goodbye. Sentence10: I'd like to know if I can book a reservation for 7 people at 18:00 monday. Sentence11: How about 17:00? Sentence12: I need to find a swimming pool in the north. Sentence13: There are 2 swimming pools in the north, jesus green outdoor pool and kings hedges learner pool. Which one would you like more information on? Sentence14: Either one will work, I just need to book for 7 people at 18:00 on monday? Sentence15: I've got you booked at 17:00 for 7 at Pizza Express. Sentence16: Kings Hedges Learner Pool is in postcode cb42xh. Their entrance fee is a bit of a mystery, however, I don't have any firm numbers. Can I help with anything else? Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System