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: Hello, I am Sharon Rodriguez. 
 agent: Hello, how may I serve you today? 
 customer: Owing to an emergency, I just want to cancel my recent reservation. Could you please help me? 
 agent: Ok, hold on a moment, let me check the your reservation status and get back to you. 
 customer: Sure. 
 agent: We could not found your reservation in our database. 
 customer: Ok, no issues. Thank you for your response. 
 agent: Thank you for selecting our service.
no_reservation