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 guide you? 
 customer: I'm Sarah Young. I need your help in cancelling my ticket, please help me with that. 
 agent: Sure, give me a minute. 
 customer: Ok. 
 agent: Sorry, there is no reservation found under your name. 
 customer: That's ok, thank you for your information. 
 agent: Thank you for reaching us.
Output:
no_reservation