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  help you? 
 customer: Could you help me in booking a flight ticket from IAD to JFK? 
 agent: Your travelling dates pleas? 
 customer: My departure day is Mar 07, return day is Mar 09. 
 agent: Do you have any specifications? 
 customer: I want a economy class flight ticket. And I want a flight with one connection. 
 agent: May I know your name please? 
 customer: My name is Emma Moore. 
 agent: I am sorry no flights found on your route. 
 customer: Not an issue, thank you. 
 agent: Thank you for choosing us.
A:
no_flight