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. How can I help you now? 
 customer: I am Nancy Jones, I want to change my recent reservation. Can you please help me with it? 
 agent: Sure, I can help you in that. 
 customer: Thank you. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: Sorry Nancy Jones, there is no active reservation on your name to change it. 
 customer: No issues, thank you for your assistance. 
 agent: Thanks for choosing us.
A:
no_reservation