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. I am Patricia Collins. 
 agent: Hello, how may I help you today? 
 customer: My baseball tournament has been postponed due to rainfall.So I would like to change my existing reservation. Can you please help me? 
 agent: Sure, please wait for a while. 
 customer: Ok. 
 agent: Sorry, there is no reservation found on your given name. 
 customer: Ok, not an issue. 
 agent: Thanks for choosing us. 
 customer: Thank you for your service.
A:
no_reservation