Instructions: 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. How can I aid you? 
 customer: I want to book a flight ticket from New York, NY - EWR for a Holiday Vacation. Can you book me a flight ticket with price of 200? 
 agent: OK, may I know your travel dates? 
 customer: My trip dates are 12/03 - 12/05. 
 agent:  Help me with your destination point? 
 customer: I want to reach to Boston, MA - BOS. 
 agent: Do you have any preference? 
 customer: I need a connecting flight. 
 agent: Ok, please wait I will revert you. 
 customer: Ok. 
 agent:  we found a connecting flight Spirit with flight number 1004 and fare is 200. Shall I proceed? 
 customer: Please proceed. My name is Edward Lopez. 
 agent:  Your booking is done. 
 customer: Thank you. 
 agent:  Thank you for opting us.
Output:
book