Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello. 
 agent: Hello. How may I help you today? 
 customer: Please reserve a flight ticket from OAK to DCA to meet my old family friends. 
 agent: Sure, I am here to assist you in booking. 
 customer: Thank you. 
 agent: May I know your travelling dates please? 
 customer: I have planned to leave on Apr 15th and return on Apr 17th. 
 agent: Can you please share me your good name? 
 customer: Myself Michelle Brown. 
 agent: Do you need any other requirements? 
 customer: I prefer normal cost airline. 
 agent: There is an airline called Delta of flight 1024 in an economy class with single connection. Can I confirm your booking? 
 customer: It's good, please reserve it. 
 agent: Your flight ticket has been confirmed on name of Michelle Brown. 
 customer: Thank you. 
 agent: Thank you for availing us.
Student:
book