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: Hello, I am James Brown. 
 agent: Hello, how can I help you today? 
 customer: My son is giving a performance in an International competition at CO - DEN. Can you help me out with booking from NV - LAS. 
 agent: Sure, please help me with your travelling dates? 
 customer: I will leave on 04/04 and return on 04/06. 
 agent: Ok, any connection limit? 
 customer: Yes, I need a halt. 
 agent: Ok, please hold on a moment. 
 customer: Ok. 
 agent: Thanks for waiting, no flights found with your requested details. 
 customer: It's Ok. 
 agent: Thank you for choosing us. 
 customer: Thanks for the information.
A:
no_flight