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. How can I assist you today? 
 customer: Please help me to book a flight ticket from PHL to EWR? 
 agent: Sure, can you please share your travel dates? 
 customer: My travelling dates are Sept 12 to Sept 14. 
 agent: May I know your connection limit? 
 customer: I need a single connection of flight. 
 agent: Do you have any other specification that you are looking for? 
 customer: I want to depart in the afternoon. 
 agent: May I know your name to proceed further? 
 customer: Helen Evans here. 
 agent: I am sorry to inform you that there is no flight available at your request. 
 customer: No problem, thank you. 
 agent: Thank you for contacting us.
Solution:
no_flight