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, How can I respond to your request? 
 customer: Can you please book a flight ticket from DEN to CLT? 
 agent: Sure, we are glad to help you. Can you please share your journey dates that you prefer to travel? 
 customer: Thank you. I have planned my travel  dates as Dec 30 and Jan 01. 
 agent: Do you need any layover in between journey? 
 customer: I am looking for direct flight so please make sure that. 
 agent: Ok, May I know your good name please? 
 customer: Sure, myself Jason Lee. 
 agent: Is there any other specifications regarding your journey? 
 customer: No, I do not have any other specifications. 
 agent: Ok, please wait a moment. let me search a flight for you. 
 customer: Sure, take your time. 
 agent: Sorry to inform you that, currently no flights are running at that locations due to abnormal weather conditions. 
 customer: Oh! It is sad to hear. Anyway, thank you for your time. 
 agent: Thanks for approaching us. 
 customer: Most welcome.
A:
no_flight