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 help you today? 
 customer: Janet Garcia here. I want to cancel my ticket due to snow storm in my place. 
 agent: Sure, I will help you. Please wait for a moment. 
 customer: Ok. 
 agent: Sorry Garcia, there is no existing reservation existing on your name. 
 customer: No problem, thank you. 
 agent: You are welcome, have a nice day.
Output:
no_reservation