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
Q: customer: Hello. 
 agent: Hello, how can I be of your help? 
 customer: Ryan Lewis here. I have a tournament in  febway park at Boston, help me in booking my flight ticket with single stopover. 
 agent: Sure, please share me your travel dates. 
 customer: I would like to start on 04/24. My return journey will be on 04/26. 
 agent: Provide me your airport codes please. 
 customer: I would like to board from CO-DEN . My landing airport code is MA-BOS. 
 agent: Sorry for the inconvenience, there are no flights with your requirement. 
 customer: No issues, thank you for your assistance. 
 agent: Thank you.
A:
no_flight