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 aid you today? 
 customer: I am looking to book a flight ticket from BOS to LAX. Can you help me for that? 
 agent: Sure, I am here to help you. May I know your travel dates please? 
 customer: My travelling dates are Jan 25 and Jan 27. 
 agent: Ok, do you have any specifications? 
 customer: I prefer to book a single connecting flight. 
 agent: Ok, hold on for a moment. Let me check the best available flight for you. 
 customer: Sure, I will wait for your response. 
 agent: I found a flight for you with Frontier Airlines and it costs you 100. Shall I proceed in this direct flight? 
 customer: Ok, proceed for booking. 
 agent: On whose name you would like to book this ticket? 
 customer: My name is Larry Walker. 
 agent: Your ticket has been booked with 1003 flight number. 
 customer: Thank you for booking. 
 agent: Welcome, thank you for choosing us. Have a safe flight.
Output:
book