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: Pamela Moore here. 
 agent: Welcome to airline agency, how can I assist you today? 
 customer: I am planning to go to Art Museum of Philadelphia and also planning to visit popular places in Philadelphia, can you please help me in booking my ticket on my preferable dates? 
 agent: That's nice to here. I will definitely help you out with booking the flight ticket. 
 customer: Thank you. 
 agent: Will you please provide your preferable dates that you want to travel? 
 customer: I am preferring to fly on 01/07 and would like to return on 01/09. 
 agent: For ticket booking purpose the airport codes are needed. Will you mention your airport codes please? 
 customer: My departure and arrival airport codes that are nearer to me are PHX and PHL. 
 agent: Please give me a moment for checking the flight availability. 
 customer: Sure, take your time. 
 agent: Thank you for waiting. 
 customer: Its my pleasure. 
 agent: There is no flights are available for your preferable journey details. 
 customer: Ok no issues, I will choose another way to reach there. Thank you for your services. 
 agent: Thank you for reaching us. Have a great day.
Solution:
no_flight