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: Hi, Michael Baker here. 
 agent: Hello, how may I serve you today? 
 customer:  I want to attend Steampunk festivals at Detroit with the fare of 1000. Can you please help me in booking a flight ticket? 
 agent: Sure, may I know your connection limit? 
 customer: I need a direct flight. 
 agent: Ok, can you please share your journey dates? 
 customer: I want to start my journey on 03/19 and return on 03/21. 
 agent: Please assign your airport codes. 
 customer: Source and destination is from SEA to DTW. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Sorry for inconvenience, we found a connected flight based on your journey dates. 
 customer: Ok, no issues. Thanks for the information. 
 agent: Thank you for reaching us. Have a nice day ahead.
no_flight