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. I am Dennis Campbell. 
 agent: Hello, how can I help you today? 
 customer: I am planning to attend music concert at OAK, can you please help me with booking a flight ticket from EWR? 
 agent: Sure, may I know your planned travel dates? 
 customer: Sure, I would like to take off on Feb 22 and return on Feb 24. 
 agent: Is there any class preference for you? 
 customer: No, but I would like to return during evening time. 
 agent: Do you have any other specifications? 
 customer: I need a flight with 1 connection. 
 agent: Sorry to say that, no flights were found with your given details. 
 customer: Ok, no issues. Thank you for checking. 
 agent: Thank you for reaching us. 
 customer: You are welcome.
A:
no_flight