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 Edward Walker. 
 agent: Hello, Please inform me, How may I assist you the day? 
 customer: Prepone plan came into a picture owing to announcement of birth of baby boy.So I need to cancel my recent reservation. Can you please help me in cancellation? 
 agent: Sure, I can help you in that cancellation. 
 customer: Thank you. 
 agent: Please allow me a moment to check for the previous reservation in our data base. 
 customer: Sure. 
 agent: We are sorry to inform that, there is no active reservation found on your name. 
 customer: Ok, no issues. Thank you. 
 agent: Thanks for choosing us. wish you a nice day.
no_reservation