Definition: 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, I am Alexander Anderson. 
 agent: Hello, How exactly can I serve you now? 
 customer: I am excited to go Haunted Pub tour at Washington,DC - DCA. Can you help me with booking a connecting flight? 
 agent: Ok, please share your travelling dates? 
 customer: I will fly on 03/20 and 03/22. 
 agent: May I know your source code? 
 customer: I want to board from Detroit, MI - DTW. 
 agent: Ok, please wait. 
 customer: Sure. 
 agent: We found a 1007 Delta airline, with fare 100 for your journey. 
 customer: Please proceed. 
 agent: Your booking is done. 
 customer: Thanks for your assistance. 
 agent: Thanks for approaching us.
Output:
book