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

Sentence1: I need to depart from Cambridge, leaving after 20:30 Sentence2: Okay! What would you like to know? Sentence3: No thank you! I just need the arrival time, travel time, and train ID. Sentence4: Yes I need a train that leaves on monday going to birmingham new street. Sentence5: There are three trains that depart after 20:30 The first one departs at 21:01. Would you like to book a seat? Sentence6: Thank you so much! Sentence7: First, I need a cheap guesthouse in the centre. It should have free WiFi. Sentence8: Is there anything else I can help you with? Sentence9: Great thank you Sentence10: No that's all thank you. Sentence11: There are trains every hour to birmingham new street. It takes 163 minutes. What time would you like to travel? Sentence12: I would prefer the 4 star rated one. I need to book it for 2 people for 4 nights starting friday. Sentence13: Can I help you with anything else? Sentence14: Yes I have two one is rated 4 stars and the other has a 0 star rating. Which do you prefer? Sentence15: I am looking for information in Cambridge Sentence16: Okay. Your booking at the Alexander Bed and Breakfast was successful. Your reference number is 7IL8SAJV . Sentence17: TR2392 arrives at 23:44. I travels for 163 minutes. Sentence18: You're welcome, have a great day! Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System