Instructions: 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
Input: customer: Hi. 
 agent: Hello. 
 customer: Betty Anderson here. 
 agent: How can I help you today? 
 customer: I want to cancel my reservation today, can you help me? 
 agent: Ok, please wait for a moment. 
 customer: Take your own time. 
 agent: Sorry Betty, no reservation found under your name. 
 customer: Oh! That's sad to know. Thank you for checking anyways. 
 agent: Thank you. 
 customer: Most welcome.
Output:
no_reservation