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, may I know your name? 
 customer: I want to change my existing reservation which is with the name Brenda Smith as my Business meeting got postponed. 
 agent: Please wait for a moment, while I check. 
 customer: OK, sure. 
 agent: Thanks for waiting, sorry to inform there is no reservation found on your name. 
 customer: OK, that's fine. Thank you. 
 agent: Thank you to connecting with us, have a nice day.
A:
no_reservation