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: Hi. 
 customer: I am Ronald White. 
 agent: How can I help you Ronald White? 
 customer: Prepone plan came into a picture owing announcement of birth of baby boy. So I need to cancel my recent reservation, can you please help me in that? 
 agent: OK. Give me a moment. 
 customer: Sure. 
 agent: Sorry we couldn't find any reservation on your name. 
 customer: That's not a problem. 
 agent: Thank you for reaching ours. 
 customer: Thank you.
Output:
no_reservation