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 aid you today? 
 customer: Can you help me in changing my recent reservation? 
 agent: Sure, for further proceeding to change your reservation. May I know your name? 
 customer: I am Charles Carter. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: We are regret to inform you that there is no active reservation on your name in our data. 
 customer: Its ok, thank you. 
 agent: Thanks for reaching us.
A:
no_reservation