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: Hi. 
 agent: Hello, how may I guide you? 
 customer: Debra Thomas here. Can you make my reservation from BOS to DCA? 
 agent: Can I know your preferable dates? 
 customer: My travelling dates are from 07/24 to 07/29. Please check with 1 connection. 
 agent: I am sorry, there are no flights with 1 connection. 
 customer: It's ok. Anyway, thank you. Thanks. 
 agent: Thank you, have a good day.
Output:
book