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 can I assist you at this moment? 
 customer: I am Sarah Thomas, can you help me to book a flight ticket from ATL to BOS? 
 agent: Sure, can you please provide your travelling dates? 
 customer: Ok, my depart date is 05/02 and return date is 05/04. 
 agent: Wait a moment please. 
 customer: Ok, take your own time. 
 agent: Spirit airlines is available on this route with a ticket fare of 100, shall I book your ticket? 
 customer: Please book it. 
 agent: Sarah Thomas, your ticket is booked with flight number 1007. 
 customer: Thank you for booking the flight with Spirit airlines. 
 agent: Thank you, have a safe journey.
Output:
book