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
Problem:customer: Hello. 
 agent: Hello. 
 customer: John Lewis here. 
 agent: How can I assist you at this moment? 
 customer: I need a connecting flight from PHL to ATL, can you please help me in booking a flight ticket? 
 agent: Sure John Lewis, I will help you with that. Can I have your travel dates please? 
 customer: Sure, my trip dates are from 05/07 to 05/09. 
 agent: Ok, please wait a moment to check flight availability. 
 customer: Ok, I will wait for your response. 
 agent: Sorry John Lewis, no flight is available  to you on your dates due to some weather conditions in your route. 
 customer: That's ok, no problem. Anyway thank you for the information. 
 agent: Thank you for choosing us, have a good day.
Solution:
no_flight