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: Hello. 
 agent: Hello, how may I help you? 
 customer: I have to change my reservation due to my planned trip got postponed. So  please help me with that. 
 agent: Sure, please share your good name? 
 customer: Thank you. Please check the reservation with my name Thomas Taylor. 
 agent: Please wait for a while. 
 customer: Sure, take your time. 
 agent: Sorry, no reservation found on your given name. 
 customer: Oh! It may not be booked properly. Anyway, thank you for your time. 
 agent: Thank you for choosing us. 
 customer: Most welcome.
Solution:
no_reservation