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 Katherine Clark. 
 agent: Hello, how can I help you? 
 customer: I need to book a flight ticket from OAK to PHL, can you please help me to book a flight ticket? 
 agent: Sure, please share me your travelling dates? 
 customer: My journey dates are Mar 17 and Mar 19. 
 agent: Do you have any specifications? 
 customer: I need a halt. 
 agent: We found 1021 UA airline with single connection and price of 200. 
 customer: Please proceed with my booking. 
 agent: your booking is done. 
 customer: Thank you for your help. 
 agent: Thank you for reaching us.
Output:
book