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, how can I aid you? 
 customer: Please help me to book a flight ticket from MSP to OAk. 
 agent: Please provide your journey dates. 
 customer: My travel dates are 06 to 08 of July. 
 agent: Do you need any connection limit? 
 customer: I need a connecting flight. 
 agent: Do you need any other specifications? 
 customer: I prefer to return in the morning. 
 agent: May I know your name? 
 customer: I am Emily Smith. 
 agent: There are no flights available on your routes. 
 customer: It's ok, not a problem, thank you. 
 agent: Thank you for choosing us.
Output:
no_flight