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. 
 agent: Hello. 
 customer: I am Janet Perez. 
 agent: How best can I guide you from my end? 
 customer: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that? 
 agent: Please hold a moment. 
 customer: Sure. 
 agent: Thank you for waiting, there are no reservation found on the given name. 
 customer: Ok, no issues. Thanks for the information. 
 agent: Thank you.
Output:
no_reservation