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 Kimberly Hall. 
 agent: Hello. How can I help you? 
 customer: I would like to travel from HOU to EWR. can you please help me to book a ticket? 
 agent: Help me with your boarding and landing dates? 
 customer: My travelling dates will be on 03/04 to 03/06. 
 agent: Do you have any preferences? 
 customer: I need  a connecting flight. 
 agent: We found a connecting flight Southwest with flight number 1013 and price is 600. 
 customer: You can proceed to booking. 
 agent: Your booking is confirmed. 
 customer: Thank you. 
 agent:  Thanks for opting us.
Output:
book