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 support you? 
 customer: I want to book a connecting flight ticket as I have planned to go for a Hummer Tour. Please help me out. 
 agent: Sure. Let me know your scheduled dates of journey. 
 customer: My travelling dates are from 01/30 to 02/01. 
 agent: Could you please provide your boarding and landing airport codes? 
 customer: My source code is TX- DFW and Destination code is NV- LAS. 
 agent: Please wait for a while, I will check the availability of flights and revert you. 
 customer: Ok. 
 agent: Thank you for your patience. Unfortunately there are no flights available with your requirements. 
 customer: Ok, no issues. Thank you. 
 agent: Let me know your good name please. 
 customer: I am Kimberly Phillips. 
 agent: Thank you for reaching us.
Output:
no_flight