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. What help that you need from my end? 
 customer: I need a direct flight for my journey to PHL from PHX to attend a client meeting. Can you help me in booking my flight ticket? 
 agent: Sure, I am glad to help you and I need your travel dates to book a flight ticket. Can you please provide it? 
 customer: Thank you for considering my request. My travel dates are June 30 and July 02. 
 agent: Do you have any other specification that you would like to mention? 
 customer: No. 
 agent: Be on hold for a moment. 
 customer: Sure. 
 agent: Can I know your name please? 
 customer: Sure, my name is Angela Parker. 
 agent: I regret to inform you that there is no flight obtained on your travel dates and locations to book the ticket. 
 customer: No issue with that, anyways thank you for checking me the flight. 
 agent: Thank you for reaching us and next time we can serve you better, most welcome.
Output:
no_flight