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

customer: Hello. 
 agent: Hello,. How can I assist you? 
 customer: I want to change my existing reservation due to the bad health conditions. Can you help me? 
 agent: Please provide your name? 
 customer: Gary Davis is my name. 
 agent: No reservation found by name Gary Davis. 
 customer: No problem. Thank you for your information. 
 agent: Thanks. Have a nice day!.
no_reservation