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 help you? 
 customer: Can you help me to change my recent reservation because my trip dates are got postponed? 
 agent: I will help you with that please share your name to proceed further? 
 customer: Edward hall here. 
 agent: Please wait for a while. 
 customer: Sure, take your own time. 
 agent: There is no active reservation found under your name to amend it. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for choosing us.
Output:
no_reservation