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, Emma Thompson here. 
 agent: Hello, how can I serve you today? 
 customer: I want to book a flight ticket to go for a flower's festival  on 01/04, so I want to travel on 01/03 and return on 01/05. Can you please book me a flight ticket on those dates? 
 agent: Sure, we are here to help you. Kindly mention your price limit. 
 customer: Sure, I can pay up to 500. 
 agent: Could you please provide me your airport codes? 
 customer: Yes, my airport codes are Washignton,  DC-DCA and Orlando, FL-MCO. 
 agent: Do you need any connection preference in between the journey? 
 customer: Yes, I need a connecting flight. 
 agent: Ok, please wait a moment. 
 customer: Ok. 
 agent: Sorry to inform, no flights found with your requirement. 
 customer: That's ok. 
 agent: Thanks for reaching us, have a good day. 
 customer: Thank you for the response.
no_flight