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. 
 customer: Shirley Williams here. 
 agent: How can I help you? 
 customer: I'm planning to visit New York, can you book a ticket from DFW to LGA? 
 agent: May I know your desired travel dates please? 
 customer: Sure, my planned departure and return travel dates are 8th an 10th of April. 
 agent: There is a flight with connection limit 1 and fare 100, shall I proceed for booking? 
 customer: That's fine for me, you can proceed for booking the ticket. 
 agent: Your ticket is booked, flight number 1001. 
 customer: Thank you so much for your help. 
 agent: Thank you for opting us.
Output:
book