Definition: 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
Input: customer: Hello. I am Joseph Harris. 
 agent: Hello, do you need any help from us? 
 customer: I would like to travel from LAS to LAX, can you please help me to book a flight ticket? 
 agent: Sure, may I know your departure and arrival day? 
 customer: I prefer to travel on 10/05 and 10/07. 
 agent: There is a flight available from Southwest airline which matches with your requirement, can I proceed to book it? 
 customer: Ok, please confirm my booking. 
 agent: OK, your ticket is booked with flight number 1003. 
 customer: Thank you for your help. 
 agent: Thank you for consulting us, have a great day.
Output:
book