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: Hi. 
 agent: Hello. May I know your good name, Please? How can I assist you for the day? 
 customer: I am Emily perez. I want to book a flight ticket from TX-DFW to DC-DCA. 
 agent: OK. May I know your travel dates, Please? 
 customer: Sure, 01/05 and 01/07 are my journey dates. 
 agent: May I know, What is your price limit? 
 customer: 200 is my price limit. 
 agent: We are very sorry to inform you that, There are no flights available for your travel dates. 
 customer: NO issue. 
 agent: Thank you, For making an inquiry with us regarding ticket booking. 
 customer: Thank you for your response. 
 agent: Have a nice day.
Output:
no_flight