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. 
 customer: Nancy Thompson here. 
 agent: How can I assist you at this moment? 
 customer: I am a social activist, I have to host a campaign for orphans. Could you book my ticket from ORD to AUS? 
 agent: Sure, can you please share your travel dates to proceed further? 
 customer: My itinerary dates are 09/16 and 09/18. 
 agent: Give me a moment please. 
 customer: Sure. 
 agent: Southwest airlines is available with a ticket fare of 100 and 1 connection limit, shall I proceed to book your ticket with this flight? 
 customer: Please proceed. 
 agent: Nancy Thompson, your ticket is booked with flight number 1019. 
 customer: Thank you. 
 agent: Thank you for approaching us, have a safe journey.
Output:
book