Detailed Instructions: 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
Problem:customer: Hello. 
 agent: Hello. 
 customer: Emily Clark here. 
 agent: How may I lend a hand to? 
 customer: I need to have a flight ticket from OAK to AUS for an important business meeting, can you please help me out with booking of a flight ticket on those locations? 
 agent: Sure Clark, When you are willing to travel? 
 customer: I would like to start my journey on 12/29. 
 agent: Just a moment. 
 customer: Sure. 
 agent: Can you please share me your return dates? 
 customer: I would like to return on 12/31. 
 agent: Clark sorry to intimate, no flights are available with your requirements. 
 customer: Oh! Sad to hear that. Anyway, I will contact another agency to go there. Thank you for the information. 
 agent: You are welcome, thank you very much for contacting us.
Solution:
no_flight