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: Hi. 
 agent: Hello, how can I help you? 
 customer: Help me in booking a flight from EWR to IAH? 
 agent: Sure, I am happy to help you. Can you please help me with your travelling dates? 
 customer: I like to travel on Sept 19 to 21. 
 agent: Do you prefer any stopover in between journey? 
 customer: I prefer to travel in single connection flight. 
 agent: Are there any other specifications for you? 
 customer: No. 
 agent: May I know your good name? 
 customer: I am Matthew Walker. 
 agent: American Airlines is providing connecting flight with the ticket fare of 200 and depart time is 0:00 hours, arrival time is 17:00 hours. Shall I proceed? 
 customer: Proceed for booking. 
 agent: Ok, your ticket is reserved in an economy class and the flight number is 1002. 
 customer: Thank you very much. 
 agent: Thank you for choosing us.
Output:
book