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: Hi, Katherine Smith here. 
 agent: Hello, How can I support you? 
 customer: I recently reserved a ticket to give a visit to my best friend. But, before my journey she came to my home and gave me a surprise visit. So, now I want the ticket to be cancelled. Can you please help me? 
 agent: Sure, I am here to help you. Please wait a minute. I will check and let you know. 
 customer: OK. 
 agent: Thank you for your patience. There is no recent reservation found against your name. 
 customer: OK, Thank you. 
 agent: Thank you for contacting us.Have a great day.
A:
no_reservation