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: Hi, I am Deborah Lopez. 
 agent: Hello, how can I aid you today? 
 customer: Owing an emergency want to change my reservation, can you help me with it please? 
 agent: Ok, please wait a moment. 
 customer: Ok. 
 agent: Sorry to say, no reservation found with your name. 
 customer: That's ok, thank you for the response. 
 agent: Thanks for reaching us, have a good day.
Output:
no_reservation