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. 
 agent: Hello. How can I assist you? 
 customer: I am Melissa Allen. I am looking for a flight from OAK to ATL, can you reserve the flight ticket in that route? 
 agent: Sure, can you please share your trip dates? 
 customer: My trip dates are from 02/01 till 02/03. 
 agent: Here, I found a flight for you with 1 connection and fare is 100. Can I proceed? 
 customer: Please proceed with it. 
 agent: Your booking is done with flight 1004 and airline is AA. 
 customer: Thank you for your help. 
 agent: Welcome, have a nice day.
Output:
book