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 today? 
 customer: I am Jacob Jones. 
 agent: OK. 
 customer: I would like to board from Seattle, WA-SEA to Detroit, MI-DTW for attending a meeting. Could you please help me with booking a direct flight? 
 agent: Sure, I am here to help you. May I know your travel dates please? 
 customer: Sure, I want to depart on 04/20 and arrive on 04/22. 
 agent: Ok, please wait. 
 customer: Sure. 
 agent: Thanks for waiting, we found connecting flight 1021 in Hawaiian airline with fare of 100. Shall I proceed to book? 
 customer: I need a direct flight, can you please recheck it? 
 agent: Ok. Sorry, there are no flights available with your journey routes. 
 customer: It's Ok, I will choose another alternative to reach my destination. 
 agent: Thank you for reaching us. 
 customer: Thank you for the information.
no_flight