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. 
 agent: Hello. How may I help you? 
 customer: Can you please help me in booking my flight ticket from JFK to PHL? 
 agent: I am happy to help you, may I know your travel dates? 
 customer: My trip dates will be June 2nd and June 4th. 
 agent: Ok, let me know your connection limit. 
 customer: I need a connecting flight. 
 agent: Do you have any other preferences. 
 customer: I prefer a economy flight which should depart in the afternoon. 
 agent: May I know your name in the meanwhile? 
 customer: I am Anthony Campbell. 
 agent: Sorry, no flight is available for you on your route. 
 customer: Its ok, thank you. 
 agent: Thanks for choosing us.
Output:
no_flight