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. 
 agent: Hello. Can you please tell me how can I assist you? 
 customer: I want to cancel my brother's reservation because he have some urgent work at his office, can you please help me out? 
 agent: Ok, sure. Can you please tell me your brother name to search for his reservation? 
 customer: Sure, his name is Andrew Scott. 
 agent: Sorry, no reservation found on your name. 
 customer: Not an issue, thank you for the information. 
 agent: Most welcome, have a nice day.
no_reservation