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. 
 agent: Hello. 
 customer: I am Laura Edwards. 
 agent: How can I assist you today? 
 customer: My business meeting has been postponed, could you please help me with changing my recent reservation? 
 agent: Sure, please allow me a moment to check for the previous reservation in our data base. 
 customer: Sure. 
 agent: I appreciate your patience. Laura, there is no reservation found under your name. 
 customer: That's ok, no issues. Anyways, thank you for the information. 
 agent: You are welcome. Thank you for contacting us.
Output:
no_reservation