You will be given a definition of a task first, then some input of the task.
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

customer: Hello. 
 agent: Hello, how may I help you? 
 customer: I would like to travel from JFK to IAH, can you find flight in my route? 
 agent: Sure, may I know your travelling dates? 
 customer: My preferable dates of travelling will be from 04/19 till 04/21. 
 agent: Ok, may I know your name? 
 customer: Please, book the flight ticket on Anna Adams. 
 agent: Yes, I found  a ticket -1013 with southwest airlines, can I proceed? 
 customer: Make sure that connection limit should be 1. 
 agent: Yes, the flight is of connection 1. 
 customer: Please, proceed it. 
 agent: Yes, your ticket has been booked. 
 customer: Thank you for your service. 
 agent: Thank you for contacting us.
Output:
book