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: I am Ashley smith. 
 agent: How can I help you from flight booking agency? 
 customer: I am planning to go for bussiness trip to Minneapolis. Can you please book me a flight ticket? 
 agent: Sure, can you please share your travelling airport codes? 
 customer: My travelling departure and arrival airport codes from SEA to MSP. 
 agent: May I know your preferable journey dates to proceed further? 
 customer: My travellling dates are 03/19 and 03/21. 
 agent: Wait a moment please, let me check the flights availability on this route. 
 customer: Ok. 
 agent: AA airlines is providing the service on this route with 1 connection limit, shall I book your ticket? 
 customer: Sure, you can book the ticket for this flight. 
 agent: Ashley smith, your ticket is confirmed successfully with flight number 1018. 
 customer: Thank you for your valuable services. 
 agent: Thank you for choosing our services, have a safe journey. 
 customer: Most welcome.
Output:
book