Detailed Instructions: 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: Hi. 
 agent: Hello. How can I aid you today? 
 customer: I need to book a flight ticket from CLT to LAS to enjoy religious festivals. 
 agent: Sure. Can you please mention your preferable travel dates? 
 customer: Sure, my journey dates are Nov 23 and Nov 25. 
 agent: May I know your name for further process? 
 customer: Sure, Carolyn Walker here. 
 agent: Do you have any another specifications? 
 customer: I need a direct flight. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Sorry, no flights are available in this route as per your requested dates. 
 customer: Ok, no issues. Thank you. 
 agent: Thank you for reaching us.
A:
no_flight