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 aid you? 
 customer: I am planning to attend my friend wedding at OAK, can you please reserve flight ticket from CLT? 
 agent: Ok, may I know your desired travelling dates? 
 customer: My desired travelling dates are Nov,09 and Nov,11. 
 agent: Do you need a direct flight? 
 customer: No, I prefer one connecting flight. 
 agent: May I know your name please? 
 customer: Myself Dennis Walker. 
 agent: Do you have any other requirements? 
 customer: I prefer economy class flight ticket. 
 agent: Flight-1007 is available with economy class and 1 connection by Frontier Airlines. Can I book it now? 
 customer: Yes, please proceed the reservation. 
 agent: Your ticket is reserved, enjoy your friend's wedding. 
 customer: Thank you very much for reserving my flight ticket. 
 agent: Have a nice day.
book