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, how may I serve you? 
 customer: As I am a sports player I am visiting to a sports event at Seattle. Can you help me with booking? 
 agent: Sure, may I know your travelling dates? 
 customer: My trip dates are 07/21 to 07/23. 
 agent: Can I know your journey codes? 
 customer: My journey starts from MA-BOS to WA-SEA. 
 agent: Let me know your good name please. 
 customer: I am Betty Green. 
 agent: Thank you for sharing your details. Unfortunately there is no flight found with your requirements. 
 customer: Ok, no issues. Thank you. 
 agent: Thank you for availing us.
Output:
no_flight