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. How can I help you? 
 customer: I need you to book a flight ticket from PHL to BOS. Please help me. 
 agent: Can I know your travelling dates? 
 customer: June 03 and 05 are my planned travelling dates. 
 agent: Do you have any preference? 
 customer: I wish to depart at afternoon in a direct flight. 
 agent: Let me know your name. 
 customer: My name is Ryan Turner. 
 agent: Found ticket with Southwest airlines for price 200 having flight number 1007. 
 customer: Thank you. Please book the ticket in that flight. 
 agent: Ticket is booked. 
 customer: Thank you for the help. 
 agent: Thank you.
Output:
book