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: Okay, you're welcome! have a wonderful day! Sentence2: I need to book a taxi after 20:30. I need to go from ali baba to pipasha restaurant. Also I'll need the contact number and car type. Sentence3: Your taxi is booked. Please be on the lookout for a black volvo and the contact number is 07827592182. Is there anything else i can help with? Sentence4: No that will be all! Thank you! Question: Who has spoken the sentence 2? (A) User (B) System
Output:
Answer: (A) User