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 assist you today? 
 customer: Can you aid me to book a flight ticket from AUS to LAX? 
 agent: Sure, I will help you. Please help me with your name. 
 customer: Myself Joshua Parker. 
 agent: Please help me with your planned travelling dates. 
 customer: I planned my trip on the dates Aug 6 and Aug 8. 
 agent: Do you need a break in between your journey? 
 customer: I am looking for a connecting flight. 
 agent: Do you have any other preferences in your journey? 
 customer: I prefer morning flight at the time of depart and also make sure I prefer economy class flight with normal cost airline. 
 agent: Sure, I will check with this preferences. Please allow me a minute. 
 customer: Sure. 
 agent: Joshua Parker, I am really sorry to inform you that there are no flights available for your journey. 
 customer: No issue, anyway thank you for checking. 
 agent: Thank you for reaching us. Have a great time.
Output:
no_flight