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, I am Benjamin Smith. 
 agent: Hello Smith, how can I help you for today? 
 customer: I want to book a ticket from ATL to EWR. 
 agent: OK, could you mention your travel dates? 
 customer: My travelling dates will be from 08/25 and 08/27. 
 agent: OK, there is a flight 1005 in airline Spirit having connection 1 and price is 100. Shall I proceed with your booking? 
 customer: Sure, proceed my booking. 
 agent: OK, your booking is done. Have a great journey!. 
 customer: Thank you.
Output:
book