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: Hello. I am Emily Campbell. 
 agent: Hello, how may I assist you for today Emily? 
 customer: I need to change my reservation due to my planned event got postponed. So please help me with that. 
 agent: Sure, I will help you with that Emily. 
 customer: Thank you. 
 agent: Sorry to say this Emily, there are no active reservations with your name to change. 
 customer: Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time. 
 agent: You are welcome, thank you for reaching out here. 
 customer: Most welcome.
Output:
no_reservation