Detailed 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
Problem:customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I made a reservation earlier to visit Phoenix in direct flight but now I want to travel in connecting flight. can you help me in changing my reservation? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: May I know your name? 
 customer: I am Sandra Carter. 
 agent: Please, wait for a moment. 
 customer: Ok. 
 agent: Thank you for waiting, there is no reservation found on your name to proceed for modification. 
 customer: No issue. Thank you. 
 agent: Thank you for approaching us.
Solution:
no_reservation