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: Hi. 
 agent: Hello. 
 customer: I am David Green. 
 agent: How can I aid you today? 
 customer: I want to travel from ATL to ORD. Can you help me in booking a flight ticket? 
 agent: Sure, I am here to help you. Could you please share your travelling dates? 
 customer: I want to travel in the month of May on 19 and 21. 
 agent: May I know your price limit? 
 customer: My budget for ticket is 500. 
 agent: Ok, please hold on. 
 customer: Ok. 
 agent: There is a Southwest 1006 airline with fare of 100 and a halt in between the journey. Shall I proceed with booking? 
 customer: Proceed to booking. 
 agent: Your booking has been confirmed on name of David Green. 
 customer: Thank you for your help. 
 agent: Thank you for choosing us, have a nice day.
Output:
book