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: Hi. I am Ashley Harris. 
 agent: Hello, how may I assist you? 
 customer: Can you help me in booking as I need to attend my sister wedding? 
 agent: Sure, when are you planning to travel? 
 customer: My travelling dates are 09/18 to 9/20. 
 agent: Ok, could you please share the codes of airport on which route you want to travel? 
 customer: I will fly from SEA and land at JFK. 
 agent: Sorry to say, no flights were found on your dates. 
 customer: No issue, thank you for checking. 
 agent: Thank you for reaching us, have a nice day.
Output:
no_flight