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: Hello. 
 agent: Hello. 
 customer: I am Rachel Thompson. 
 agent: How may I help you? 
 customer: I want to change my existing reservation, due to my family tour got postponed. Could you help me in changing reservation? 
 agent: Sure. Please wait a moment, I will check for the reservation with your name. 
 customer: Ok. 
 agent: Thanks for your time, there was no reservation found on your name. 
 customer: Not an issue. 
 agent: Thank you for reaching us. 
 customer: Thanks for your service.
Output:
no_reservation