Detailed 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
Problem:customer: Hello, I am Charles Green. 
 agent: Hello, how can I help you for the day? 
 customer: Can you please help me with booking a flight ticket from JFK to OAK? 
 agent: Can you please share your travelling dates? 
 customer: My travelling dates are from Feb 04 to Feb 06. 
 agent: Do you have class preference? 
 customer: I am comfortable with any class. 
 agent: Do you need connection limit? 
 customer: I need a connecting flight. 
 agent: Do you prefer airline? 
 customer: I prefer normal cost airline. 
 agent: We found Delta Airline with fare 100 and flight number is 1010 with connecting flight. Shall I proceed with the booking? 
 customer: You can proceed with booking. 
 agent: Your booking has been confirmed. 
 customer: Thank you for the help. 
 agent: Thank you for choosing us.
Solution:
book