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 may I help you? 
 customer: I just want to change an existing reservation as my plan to meet my old friend got postpone due to some technical issues. Can you please check the reservation by the name Steven Collins? 
 agent: Sure, we are here to help you. 
 customer: Thank you. 
 agent: Sorry to inform you that there is no active reservation on your given name. 
 customer: That's ok, thank you for your information. 
 agent: Thanks for contacting us.
Solution:
no_reservation