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, Anthony Clark here. 
 agent: Hello Clark, how may I help you? 
 customer: I want to meet my business partner, can you book my ticket from SEA to PHL? 
 agent: Sure, I am here to help you. Can you please share your travelling dates to check the flight? 
 customer: My trip dates are11/16 and 11/18. 
 agent: Ok, please give me a minute. 
 customer: Sure. 
 agent: The UA airlines is with connection 1 and the price is 100. Shall I proceed? 
 customer: Please proceed. 
 agent: Ok, your ticket is confirmed with the flight number 1007. 
 customer: Thank you for assisting me. 
 agent: You are welcome. Have a safe journey. Thank you for reaching us.
book