Q: 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. 
 agent: Hello. 
 customer: I am Elizabeth Evans. 
 agent: How can I help you today? 
 customer: Can you please help me in cancelling my recent reservation, as my exam scheduled got cancelled. 
 agent: Sure, I am here to help you to cancel your reservation. 
 customer: Thank you. 
 agent: Please wait a moment. 
 customer: Ok. 
 agent: Sorry, no reservation found on your name to cancel your reservation. 
 customer: Ok, no issues. Thank you for your help. 
 agent: Thank you for choosing us, have a nice day.
A:
no_reservation