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
Input: customer: Hi. I am Charles Clark. 
 agent: Hello, how can I assist you for the day? 
 customer: I want to attend my friend wedding at Orlando, MCO. Can you help me in booking on 11/30? 
 agent: Sure, I am perky to help you. 
 customer: Thank you. 
 agent: May I know, when you are planning to catch the return flight? 
 customer: I will be return on 12/02. 
 agent: Let me know, from where would you like to board? 
 customer: I am boarding at New York, LGA. 
 agent: Please wait for a while, I will check the availability of flights and revert to you. 
 customer: Sure. 
 agent: Thank you for waiting, there are no flights available with your requirements. 
 customer: Ok, No issues. Thank you. 
 agent: Thank you for reaching us.
Output:
no_flight