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 help me in booking a flight ticket form LAS to BOS? 
 agent: Sure, I am gleeful to help you with that. May I know your planned journey dates? 
 customer: I want to travel on 09/04, and return on 09/06. 
 agent: Do you have any other specification? 
 customer: I need a break in my journey. 
 agent: May I know your name please? 
 customer: I am Joshua Scott. 
 agent: Sorry to say that, there are no flights found on this route as per your details. 
 customer: Ok, no issues. 
 agent: Thank you for reaching us, have a great day. 
 customer: Thanks for the information.
Output:
no_flight