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, Joseph Hall here. 
 agent: Hello, how can I abet you? 
 customer: Please cancel my reservation, which is reserved earlier. Due to the curfew at my home town. 
 agent: Ok. 
 customer: Thank you. 
 agent: Please wait for a while, I will check your reservation. 
 customer: Sure, I will wait. 
 agent: I am here to inform you that, there is no reservation found on your name. 
 customer: No problem at all. May be I reserved with some other airline. 
 agent: Ok. 
 customer: Thanks for your effort. 
 agent: Thank you for approaching us.
Output:
no_reservation