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 Sandra Williams, I need to book a flight ticket to ATL from DEN. 
 agent: Ok, I will book the flight for you. May I know the travel dates please to check the flight? 
 customer: Thank you, my travel dates are 05/04 and 05/07. 
 agent: There is a flight with the price 200 and the airlines is Delta. 
 customer: Yes, please proceed with the booking. 
 agent: Thank you for connecting our agency. 
 customer: Ok. 
 agent: The ticket is been booked and the flight is 1013. 
 customer: Thank you for booking my flight ticket.
book