Q: 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
customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I need to travel from DFW to LAS, can you help me in doing that? 
 agent: Sure, may I know the travelling dates? 
 customer: My journey dates are Dec 14 to 16. 
 agent: Do you have any connection limit? 
 customer: I need a connecting flight. 
 agent: Are there any other specifications? 
 customer: No. 
 agent: May I know your name? 
 customer: I am Donna Taylor. 
 agent:  Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions. 
 customer: Ok, no issues. Thank you for the information. 
 agent: Thank you for opting us.
A:
no_flight