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. 
 agent: Hello. 
 customer: Eric Taylor here. 
 agent: Eric Taylor, how may I assist you with today? 
 customer: Can you book a connecting flight to Los Angeles for my family vacation? 
 agent: Sure, I will assist you with the booking process. May I know with your planned travel dates please? 
 customer: Yes, my travel dates for the journey are from Nov 29 to Dec 01. My airport codes for the journey are from EWR to LAX. 
 agent: Thank you for the details. 
 customer: Ok. 
 agent: Please allow me a minute. 
 customer: Sure. 
 agent: Thank you for your time. I regret to say that there are no flight available in your preferred route of journey. 
 customer: Ok, that is not a problem. 
 agent: Thank you understanding. 
 customer: Thank you. 
 agent: Thank you for reaching us. Have a great day.
Output:
no_flight