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. How may I guide you today? 
 customer: I am Ryan Davis. I need to change my existing reservation as my plan to go for an historical tour got postponed. Can you please check if my reservation is active or not? If it is active, please change it. 
 agent: Sure, I will help you with that. 
 customer: Thank you. 
 agent: Please wait for a minute. 
 customer: Ok. 
 agent: I am sorry to say that there is no reservation found under your name. 
 customer: Ok, not a problem. 
 agent: Thank you for reaching us. 
 customer: Anyways, thanks for the information.
Output:
no_reservation