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 today? 
 customer: I need to reserve a ticket from SEA to EWR, can you help me in doing that? 
 agent: Sure, may I know your travelling dates? 
 customer: My trip dates are Dec 08 to 10. 
 agent: On which name shall I reserve flight ticket? 
 customer: Please reserve on the name of Kenneth Perez. 
 agent: Do you need any specifications? 
 customer: No. 
 agent: There is a flight with one connection and the price is 100 in Spirit Airlines, can I proceed with the reservation? 
 customer: Ok, please proceed. 
 agent:  Your ticket has been reserved with the flight number 1001 in economy class. 
 customer: Thank you. 
 agent:  Thank you for reaching our service.
book