Given the task definition and input, reply with output. 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: Hi, I am Betty Martinez. Due to demise of my Grandfather, I want to cancel my recent reservation. 
 agent: Hello, Betty Martinez. 
 customer: Can you please help me for cancellation? 
 agent: Sure, I will help you. Wait for a moment. 
 customer: Sure. 
 agent: Thanks for your time. Unfortunately, There is no reservation found with your name. 
 customer: Ok, not an issue. Thanks for your help. 
 agent: Thank you for reaching us.
no_reservation