Detailed 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
Problem:customer: Hi. 
 agent: Hello. How may I guide you? 
 customer: I am Emily Evans here. I want to reserve my ticket from PHL to DCA, can you please help me out? 
 agent: Emily Evans, I am here to help you for this. When you are planning to travel? 
 customer: Sure, my willing to travel dates are from Jul, 16 to Jul, 18. 
 agent: Do you have any airline specifications? 
 customer: No, but I need a connecting flight. 
 agent: Do you have any other requirements? 
 customer: Not required. 
 agent: As per your information, I found a flight with Delta Airlines and the ticket fare is 100. Would you like me to make the booking now? 
 customer: Ok, please proceed. 
 agent: Your ticket is reserved in economy class with the flight-1022. 
 customer: Thank you for your help in booking. 
 agent: Thank you very much for contacting our agency.
Solution:
book