Instructions: 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
Input: customer: Hello. 
 agent: Hello, how may I aid you? 
 customer: I am planning to visit Phoenix, can you please book me a ticket from LAX to PHX? 
 agent: Ok, may I know your preferable travelling dates? 
 customer: My preferable journey dates are from 07/11 to 07/13. 
 agent: Ok, could I know your name please? 
 customer: My name is George Allen. 
 agent: The Delta airline with flight number 1009 is available having price as 200 and connection as 1. 
 customer: Please find direct flight on this route. 
 agent: Ok, please allow me a minute. 
 customer: Sure, take your own time. 
 agent: Ok. Sorry, there is no plane as per your request. 
 customer: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information. 
 agent: Thank you.
Output:
no_flight