You will be given a definition of a task first, then some input of the task.
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. I'm Anna Robinson. 
 agent: Hello, how can I guide you for today? 
 customer: My business meeting has been postponed. So, I would like to change my existing reservation which is under my name. Can you please help me with that? 
 agent: Please give me a minute, I will find your existing reservation. 
 customer: Sure, take your time. 
 agent: Sorry, there is no reservation found under your name. 
 customer: Ok, no issues. Thank you for checking. 
 agent: You are welcome. Thank you for reaching us.
Output:
no_reservation