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. 
 agent: Hello, how can I help you today? 
 customer: Can you help me in booking my flight ticket from ORD to PHL? 
 agent: Sure, we are here to help you. Can you please share your travel dates? 
 customer: My trip dates will be Apr 12th to Apr 14th. 
 agent: Do you have any connection limit? 
 customer: I prefer a connecting flight. 
 agent: Is there any other specifications? 
 customer: I prefer a class economy. 
 agent: Please share your name. 
 customer: I am Stephen Brown. 
 agent: There is a flight with your requirement, airline is American Airlines with price 200 and single connection. 
 customer: You can proceed. 
 agent: Your booking is done and flight number is 1022 in economy class. 
 customer: Thank you. 
 agent: Thanks for reaching us.
book