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: Hi. 
 agent: Hello, how may I aid you today? 
 customer: I need to cancel my ticket due to my health issue, can you help me with that? 
 agent: Sure, I am here to help you out. Please provide me your name to check the reservation status. 
 customer: I am Elizabeth Perez. 
 agent: Please allow me a moment. 
 customer: Sure. 
 agent: Sorry Elizabeth Perez, there is no active reservation on your name in our database. 
 customer: That's ok. Thank you for your service. 
 agent: Thank you for reaching us.
Output:
no_reservation