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 may I help you? 
 customer: I have to attend a Live Concert at Phoenix, could you please help me with booking a flight ticket from LGA to PHX? 
 agent: Ok, may I know your travel dates? 
 customer: I would like to depart on Mar 23rd and return on Mar 25th. 
 agent: Let me know your connection limit. 
 customer: I am looking for a connecting flight. 
 agent: Do you have any other requirements? 
 customer: I am looking for a normal- cost airline. 
 agent: May I know your good name? 
 customer: I am Dorothy Baker. 
 agent: Sorry, no flight is running on your route. 
 customer: Ok, not an issue. Anyways, thank you for the information. 
 agent: Thanks for reaching us.
Output:
no_flight