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: Hello, I am Justin Wright. 
 agent: Hello, how can I help you today? 
 customer: Can you please help me to book a flight ticket from DCA to PHX? 
 agent: Sure, please share your planned trip dates? 
 customer: My travelling dates are June 6 to June 8. 
 agent: Ok, any other requirements to be met? 
 customer: I need a halt in between my journey. 
 agent: We found a flight- 1002 of Southwest airlines with price 100 matches your requested details. Shall I proceed? 
 customer: Ok, please proceed to book. 
 agent: Ok, your ticket has been processed. 
 customer: Thank you. 
 agent: Thank you for reaching us.
Output:
book