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. 
 agent: Hello. 
 customer: I'm Gary Moore. 
 agent: How may I assist you Gary? 
 customer: I am planning to travel from DEN to LGA to attend live music concert at New York. 
 agent: It's good to hear. May I know your preferable dates that you want to travel? 
 customer: Sure, I would like to take off on 08/02 and return back on 08/04. 
 agent: Ok Gary, please hold on a moment to check the availability of flights. Based on your information, I have found a flight with 0 connections. Is it ok for you? 
 customer: I need a flight with 1 connection. 
 agent: Sorry to inform you, there are no flights available with connection 1. 
 customer: That's ok, I will try another way to complete my trip. Thank you for checking. 
 agent: Thank you for approaching us, have a great day. 
 customer: You are welcome.
A:
no_flight