Given the task definition and input, reply with output. 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 may I support you today? 
 customer: Can you please cancel my recent reservation? As my planned trip has been cancelled. 
 agent: Sure, please share me your good name. 
 customer: Sure, my name is Emily Anderson. 
 agent: Please wait for a while. 
 customer: Sure, I'll wait for your response. 
 agent: Sorry to say that, there is no active reservation found on your name. 
 customer: Oh! That's ok, thank you for giving the information anyways. 
 agent: Thank you for opting us.
no_reservation