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. My name is Virginia Perez. 
 agent: Hello. Virginia Perez, what can I do for you today? 
 customer: I want to go for holiday trip to New York. Can you help me in booking a flight ticket on 11/21? 
 agent: Sure, we will help you in booking. How much can you afford for this trip? 
 customer: I can afford up to 1000. 
 agent: OK, do you need a return ticket also? 
 customer: Yes, I will be return on 11/23. 
 agent: Ok, please provide me your airport codes so that I can check the availability. 
 customer: My airport codes are from EWR to JFK. 
 agent: Do you have any other request to met? 
 customer: I need stopover in my journey. 
 agent: Ok Virginia, please give me a moment and I will revert to you. 
 customer: Sure. 
 agent: Sorry to inform you that there is no flight available with single stopover. 
 customer: Ok, No issues. Thank you. 
 agent: Thank you for reaching our service.
A:
no_flight