Instructions: 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
Input: customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: I am Gregory Thomas, I need to travel to Houston, IAH. So please help me to book a flight ticket from DCA. 
 agent: May I know your travelling dates? 
 customer: My planned dates are 07/16 and 07/18. 
 agent: There is a flight available with price 100 and flight number is 1018, would you like to proceed with the booking? 
 customer: Can you tell me the connection limit please? 
 agent: Connection limit is 1. 
 customer: Ok, please book my ticket for this flight. 
 agent: Your booking is confirmed. 
 customer: Thank you so much for your help. 
 agent: You are welcome.
Output:
book