You will be given a definition of a task first, then some input of the task.
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: Hello. 
 agent: Hello, how may I be at your service today? 
 customer: I have to attend a Live Concert at Seattle, could you please help me with booking a flight ticket from HOU to SEA? 
 agent: Sure, I will help you in booking the ticket. May I know your travelling dates please? 
 customer: I would like to depart on Apr 4th and return on Apr 6th. 
 agent: Do you have any other specifications? 
 customer: I am looking for a connecting flight. 
 agent: Please help me with your name for booking. 
 customer: I am Nancy Scott. 
 agent: Sorry for this inconvenience, I could not find any flight with your requirements. 
 customer: Ok, not an issue. 
 agent: Thank you for reaching us. 
 customer: Anyways, thank you for the information.
Output:
no_flight