Given the task definition and input, reply with output. 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 may I help you? 
 customer: I am planning to visit my Grand Parents in Phoenix, can you please make a reservation form SEA to PHX? 
 agent: May I know your travel dates? 
 customer: My journey dates are, depart on Aug 14th and intend to return back on Aug 16th. 
 agent: May I know your name please? 
 customer: Kimberly Wilson is my name. 
 agent: May I know your class preferences? 
 customer: I want to travel in business class. 
 agent: May I know your connection limit? 
 customer: I need a break, so I prefer one connection. 
 agent: Give me a while. 
 customer: Sure. 
 agent: No flights found as per your preferences. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for choosing us.
no_flight