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 help you? 
 customer: Can you please aid me in changing my existing reservation under the name of Karen Taylor? 
 agent: Sure, please be on hold. 
 customer: Ok. 
 agent: We found a reservation in your name. Can I have your journey details? 
 customer: My new airport codes are PHL - IAH. I will start on 05/24 and return on 05/26. 
 agent: We found a flight in an airline JetBlue with a couple of connections. Shall I proceed? 
 customer: Do not proceed. 
 agent: OK, thank you. 
 customer: Thank you.
A:
no_reservation