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 aid you? 
 customer: I am looking for a flight from BOS to MSP, can you help me? 
 agent: Sure, can you please let me know your trip dates? 
 customer: My travelling dates are 01 to 03 of Nov. 
 agent: Do you have any connection limit preference? 
 customer: I need a connecting flight. 
 agent: Could you help me with your name please? 
 customer: Karen King. 
 agent: Sorry, there is no flight available for the mentioned dates. 
 customer: It's ok, not a problem, thank you. 
 agent: Thank you for reaching us.
A:
no_flight