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: Hello. 
 agent: Hello. 
 customer: My name is Kenneth Wilson. 
 agent: How can I aid you? 
 customer: I am planning to book a flight ticket at Minneapolis,  MSP to meet my friend. Could you help me in booking a flight ticket from LGA? 
 agent: Sure, I am glad to help you in booking. May I know your planned travel dates? 
 customer: My planned travel dates are from 02/21 to 02/23. 
 agent: Ok, please allow me a moment to check for the flight availability. 
 customer: Sure, I will wait for your response. 
 agent: Thank you for waiting. Here, there are no flights available for your desired dates. 
 customer: That's ok, no problem, thank you for checking. 
 agent: Thank you for reaching us.
Output:
no_flight