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 Kimberly Hill. 
 agent: How can I assist you? 
 customer: I am planning to travel from BOS to ATL to attend live concert at Atlanta, can you please help me with booking a flight ticket? 
 agent: Sure, I am here to help you Hill. 
 customer: Thank you. 
 agent: Can you please provide me your travelling dates? 
 customer: Sure, I would like to take off on 01/15 and return back on 01/17. 
 agent: Ok, give me a moment. 
 customer: Sure, take your time. 
 agent: Sorry for inconvenience, as per your required dates we didn't found a flight for you. 
 customer: Ok, no problem. I will search for another way to complete my trip. Thank you for checking. 
 agent: You are welcome. Thank you for choosing us. 
 customer: You are welcome.
A:
no_flight