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 can I assist you? 
 customer: I am planning to attend Orientation in Temple University which is at Philadelphia, PA - PHL, Could you please help me in booking a ticket? 
 agent: Sure, please share your origin airport code. 
 customer: My origin is Detroit, MI - DTW. 
 agent: Let me know your travelling dates. 
 customer: I want to start on 11/10 and return on 11/12. 
 agent: Please share your specifications. 
 customer: Please make sure that the price limit should be 5000. 
 agent: We found a flight with single connection and price is 800 of 1010 flight. Shall I proceed for booking? 
 customer: Ok, please proceed for booking. 
 agent: Your ticket has been confirmed with AA airlines. 
 customer: Thank you. 
 agent: Thank you for choosing us. May I know your name? 
 customer: Sure, I am Deborah Jones. 
 agent: Thank you.
book