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: Hi. 
 agent: Hello. How can I assist you? 
 customer: My visit to the Planetarium has been postponed, due to some technical issues. This is the reason, I want to change my reservation with the name of Carol Adams. 
 agent: Ok, please wait. 
 customer: Ok. 
 agent:  Sorry, no reservation was  found on your name. 
 customer: No, problem. I will check with another option. 
 agent: Thank you, have a nice day. 
 customer: Thank you for your information.
Output:
no_reservation