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 today? 
 customer: As my father's retirement date was postponed, due to this I want to cancel my reservation. Will you help me in this with the name of Janet Turner? 
 agent: Sure. Wait for some time. 
 customer: Sure. 
 agent: There was no reservations found on your name. 
 customer: Ok, no problem. 
 agent: Thanks for choosing us. 
 customer: Thank you for your information.
Output:
no_reservation