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: Hello. 
 agent: Hello. How may I help you? 
 customer: Can you please check the availability of flights in between the points Washington and Boston? 
 agent: Sure, may I know you trip dates? 
 customer: I will depart on 08/10 and return on 08/12. 
 agent: Help me with the airport codes? 
 customer: Sure, my source airport code is DC - IAD and destination airport code is MA - BOS. 
 agent: May I know your name please? 
 customer: Sure, I am Deborah Phillips. 
 agent: We found a flight in an airline Southwest with 1020 number having a single connection price of 100. Shall I reserve? 
 customer: Ok, please proceed for booking. 
 agent: Your flight ticket has been processed. 
 customer: Thank you. 
 agent: Thank you.
Output:
book