Detailed Instructions: In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: `book`: Make a new reservation, `cancel`: Cancel an existing reservation, `no_flight`: No flight found for the customer's preference, `no_reservation`: No reservation / No change / No cancellation was made in the conversation, mostly enquiring details
Problem:customer: Hello. 
 agent: Hello, how may I help you? 
 customer: I'm Charles Allen, want to travel from DCA to MSP. Can you help me in this? 
 agent: Sure, may I know your travelling dates? 
 customer: My travelling dates are from 04/21 to 04/23. 
 agent: There is a flight available as per your request in JetBlue airline with 1 connection. Shall I proceed your booking? 
 customer: Please proceed with it. 
 agent: Ok, your ticket is booked. 
 customer: Thank you.. 
 agent: Most welcome.
Solution:
book