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 assist you? 
 customer: I am Janet Allen. I am a Cop and I have to travel from DCA to EWR to investigate a case. 
 agent: Sure Allen, may I know your travelling dates? 
 customer: My travelling dates are 02/02 to 02/04. 
 agent: Ok, wait a moment. 
 customer: Ok. 
 agent: There is flight found for your request with 1 connection. Shall I proceed to book a flight? 
 customer: Please proceed. 
 agent: Your ticket is confirmed with flight number 1007 and airline is AA. 
 customer: Thank you for your help. 
 agent: Welcome, have a safe journey.
book