You will be given a definition of a task first, then some input of the task.
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. Myself Mary Mitchell. 
 agent: Hello, how can I help you? 
 customer: I am looking for a flight from DTW to DFW, can you help me in booking? 
 agent: Sure, please share me your travelling dates? 
 customer: My planned travel dates are Dec 26 and Dec 28. 
 agent: Do you have any class preference? 
 customer: No, I am not looking for any class preferences. 
 agent: Do you have any connection limit? 
 customer: Sure, I am looking for a connecting flight. 
 agent: Is there any other specifications? 
 customer: Yes, I would like to start my journey for the morning flight. 
 agent: We found 1016 American airline with single connection and price of 200, shall I proceed with booking? 
 customer: That's fine, please proceed in booking with this flight if the depart time is for morning session. 
 agent: Your booking is done. 
 customer: Thank you for the service. 
 agent: Thank you for reaching us.
Output:
book