Detailed 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
Q: customer: Hi. 
 agent: Hello, how do I assist you? 
 customer: I want to cancel my recent reservation due to health issues. 
 agent: Ok, may I know your name, please? 
 customer: I am Karen Thomas. 
 agent: Sorry, Karen Thomas we could not found any reservation. 
 customer: NO issue. 
 agent: Thank you for approaching us. 
 customer: Thank you for your response. 
 agent: Have a nice day.
A:
no_reservation