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: Hello. My name is Patricia Martin. 
 agent: Hello Patricia, I'm Travel Chat Bot! I can help you find your booking details, cancel or amendment. 
 customer: I had planned to go on a vacation, but it was cancelled.Can you cancel my recent reservation? 
 agent: Sure. I can definitely help you. I found your previous ticket. I cancelled your flight ticket  and the airline is not charging you their normal fee. 
 customer: Thank you for the help. 
 agent: Welcome.
Output:
cancel