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, I am Andrew Hill. 
 agent: Hello, how can I be helping hand to you? 
 customer: I am planning to go for Music festival at MN-MSP, can you please book a ticket from AZ-PHX? 
 agent: Sure, can you please provide your scheduled dates to travel? 
 customer: My planned dates of travel are from 12/26 to 12/28. 
 agent: Ok, may I know the budget you can afford for a ticket? 
 customer: I can afford upto 500. 
 agent: Ok, please wait for a moment I will get back to you. 
 customer: Ok. 
 agent: Sorry, we have not found any flights on your preferred dates. 
 customer: Ok, no issue. Thank you for your information. 
 agent: Thank you for contacting us, have a nice day.
Output:
no_flight