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: Hi. I am Janet Walker. 
 agent: Hello, how may I address you? 
 customer: I want to book a  flight ticket from MA-BOS to GA-ATL. Can you help me? 
 agent: Sure, let me know your travel dates. 
 customer: Thank you. 11/12 and 11/14 are my travelling dates. 
 agent: Do you need a stop over? 
 customer: I need a connecting flight. 
 agent: Is there any other requirements? 
 customer: No, Please go with the above essentials. 
 agent: Thank you for providing your details, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket. 
 customer: No issue. Thank you for the information. 
 agent: Thank you for choosing us.
A:
no_flight