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: I am Brian Walker. 
 agent: Ok. 
 customer: I have an meeting at LAX, with my company CEO. As per my company rules I need to travel only in a connecting flight. 
 agent: Sure, will you mention your travelling dates please? 
 customer: My travelling dates are 06/19 and return on 06/21. 
 agent: Please provide your source airport code. 
 customer: My source point is EWR. 
 agent: Please give me a moment. 
 customer: Sure. 
 agent: Thanks for waiting, there is no flights found under your preferable details. 
 customer: No problem, thank you for your information. 
 agent: Welcome, have a great day.
Solution:
no_flight