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: Hi. 
 agent: Hello. How can I help you? 
 customer: I am Patricia Baker. I want to stay for some more days at Minneapolis, can you please help me to change my flight reservation? 
 agent: Please wait a moment to check the reservation status. 
 customer: Sure. 
 agent: Sorry, no reservation found by your name. 
 customer: Not an issue. Anyway, thank you for checking. 
 agent: Thanks.
Output:
no_reservation