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: Hello. 
 agent: Hello. 
 customer: I am Rachel Davis. 
 agent: How can I guide you? 
 customer: I want to change my reservation, due to heavy rainfall in New York. Can you please help me in change in existing reservation. 
 agent: Sure, give me a minute. 
 customer: Ok. 
 agent: Sorry, there is no reservation found. 
 customer: That's ok, thank you for reaching us. 
 agent: Thank you for opting us.
A:
no_reservation