Given the task definition and input, reply with output. 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 can I be your helping hand today? 
 customer: I want to book a ticket from MCO to BOS to go for long trips. Can you please help me for booking? 
 agent: Sure, On what dates do you want to travel? 
 customer: My travelling dates are Sept 7 and Sept 9. 
 agent: Can you please provide your connection limit? 
 customer: I want single connection. 
 agent: Do you prefer either economy class or business class? 
 customer: I prefer business class. 
 agent: Is there any other preferences? 
 customer: No. 
 agent: To proceed further, may I know your name? 
 customer: Sure, I am Emily Carter. 
 agent: Ok, please wait for a while. 
 customer: Ok. 
 agent: We are regret to inform you that, No flights are available to that location in business class. 
 customer: Ok, no issues. Thank you. 
 agent: Thank you for approaching us.

no_flight