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. 
 customer: My name is Stephanie Moore. 
 agent: How can I assist you for the day? 
 customer: Can you please help me in changing my reservation details? 
 agent: Stephanie Moore, please wait for a moment. 
 customer: Ok. 
 agent: Sorry to inform you Stephanie Moore, no reservation was found by your name. 
 customer: It's ok, thank you. 
 agent: Thank you for reaching our assistance today. Have a nice day.
Output:
no_reservation