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 may I assist you? 
 customer: I am Andrew Evans. I am planning an outing at New York. Can you please help me to book a ticket? 
 agent: Sure, may I know your travel dates please? 
 customer: I am planning to start on 04/09 and return on 04/11. 
 agent: Ok, may I know your airport codes please? 
 customer: My airport codes are OAK and JFK. 
 agent: Ok, hold on for a moment please. 
 customer: Take your time. 
 agent: Sorry Evans, there are no flight available on your requested dates. 
 customer: No issues. Thank you. 
 agent: Sorry for the inconvenience provided. Thank you for choosing us, have a good day. 
 customer: You are welcome.
A:
no_flight