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 render you today? 
 customer: I made a reservation earlier to attend for a live concert, but due to some issues it got postponed, so I want to change my reservation. Will you help me? 
 agent: Sure, I will help you with that. 
 customer: Ok. 
 agent: Can I have your name please to check the status of your reservation? 
 customer: Sure, I am Nicholas Jones from Los Angeles. 
 agent: Please wait for a minute. 
 customer: Sure. 
 agent: Thanks for waiting, no active reservation was found on your name in the database. 
 customer: No problem, thanks for your effort. 
 agent: Thank you for reaching us.
no_reservation