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

customer: Hello. I am Joseph Lee. 
 agent: Hello, how may I amend you for the day? 
 customer: I am planning to for Death valley Adventure at Philadelphia, can you please help me in booking? 
 agent: Sure, I am rapturous to help you. Can you please share your planned dates? 
 customer: My planned dates are from 05/07 to 05/09. 
 agent: May I know your budget limit? 
 customer: I can afford upto 5000. 
 agent: Please mention your boarding and landing points? 
 customer: My boarding is at Dallas, TX-DFW and landing is at Philadelphia, PA-PHL. 
 agent: Thank you for providing the details. 
 customer: Ok. 
 agent:  we are unable to provide flight in between your journey routes due to heavy snow fall at destination airport. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for approaching us.
no_flight