Definition: 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: Hello,. 
 agent: Hello, how may I oblige you today? 
 customer: I am Paul Brown. Due to sudden changes in the dates of summit which was going to be held in the place. Could you please help me with cancellation? 
 agent: Sure, could you please hold a moment, let me check your reservation. 
 customer: Ok. 
 agent: Thanks for your time, sorry, unfortunately no reservation found with provided name. 
 customer: Ok, no issue. 
 agent: Thanks for your interest, have a pleasant day. 
 customer: Thank you for your response.
Output:
no_reservation