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. Ashley Thomas here. 
 agent: Hello, what can I do for you now? 
 customer: Due to an emergency, I need to cancel my reservation. Can you please help me with it? 
 agent: Sure, I will help you. Wait a minute, I will check and let you know the details. 
 customer: Ok. 
 agent: Thanks for being patience. Sorry to say, no reservation was found on your name. 
 customer: Not an issue, thank you. 
 agent: Thank you for your time with us.
Output:
no_reservation