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 exactly I can serve you the best today? 
 customer: I am Jeffrey Wilson. 
 agent: Ok. 
 customer: Can you help me booking a flight ticket from BOS to OAK? 
 agent: Sure, I would be happy to help you. 
 customer: Thank you. 
 agent: On which dates would you like me to book a flight ticket for you? 
 customer: I will start on July, 13 and return on July, 15. 
 agent: Ok, please wait a moment, let me search a flight for you. 
 customer: Sure. 
 agent: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions. 
 customer: No problem, thank you for the information. 
 agent: Thank you for choosing us.
A:
no_flight