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
Q: customer: Hi. 
 agent: Hello. How may I assist you today/. 
 customer: I need to change my existing reservation as my exams got postponed, Can you please help me with that? 
 agent: I will help you. Please help me with your name. 
 customer: Sharon Phillips here. 
 agent: Thank you. Please allow me a minute. 
 customer: Sure. 
 agent: Sharon Phillips, I regret to inform you that there is no booking done on your name. 
 customer: Ok, no problem. Thanks for your information. 
 agent: Thank you for reaching us. Have a great time.
A:
no_reservation