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 assist you today? 
 customer: I am planning to visit a trip at New York, EWR. Could you please help me with booking a flight ticket from HOU? 
 agent: Sure, may I know your travel dates? 
 customer: My travel dates are Feb 04 and Feb 06. 
 agent: Please share me your name. 
 customer: Sure, myself Gregory Moore. 
 agent: Do you have any specifications? 
 customer: I would prefer not to fly a low-cost Airline. Please recheck with that, my return time should be in the afternoon. 
 agent: Sorry, there is no low cost airline at this moment. 
 customer: That's ok, no problem. Thank you for the information. 
 agent: Thank you.
Output:
no_flight