You will be given a definition of a task first, then some input of the task.
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

customer: Hi. 
 agent: Hello. How can I assist you for the day? 
 customer: Can you avail me to book a flight from BOS to OAK? 
 agent: Sure, I will help you with that.  Can you please share your planned travel dates? 
 customer: My travel dates are Feb 14 and 16. 
 agent: May I know your name please? 
 customer: Matthew Edwards here. 
 agent: Do you have any class preference? 
 customer: No. 
 agent: Is there any other specifications regarding your journey? 
 customer: I prefer to travel in direct flight. 
 agent: There is a direct flight-1020 in Delta Airlines with a fare of 200. Shall I proceed with booking? 
 customer: Please proceed. 
 agent: Matthew Edwards, your booking has been done in economy class. 
 customer: Thanks for the help. 
 agent: Thank you for reaching us, have a safe journey.
Output:
book