You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: That is all I need, thank you! Sentence2: I have you in a red Toyota, contact is 07737828007. Sentence3: Thank you, have a great day. Sentence4: Ok I have a red toyota and the contact number is 07737828007. Sentence5: I am coming from rice boat and need to get to limehouse by 01:45 Sentence6: I'd be happy to help! Where are you coming from? Sentence7: Have a safe trip! Sentence8: I need a taxi to come at 1:45 to rice boat. Question: Who has spoken the sentence 7? (A) User (B) System
Output:
Answer: (B) System