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 Andrew Hill. 
 agent: Hello, how can I support you? 
 customer: I want to go for Death Valley Adventure at Seattle. Can you help me in my booking? 
 agent: Sure. Help me with your travelling dates please. 
 customer: I will start my journey on 01/14. I will return back on 01/16. 
 agent: Can I know your airport codes? 
 customer: My source airport code is Phoenix, AZ - PHX. My destination is Seattle, WA - SEA. 
 agent: Do you have any specifications? 
 customer: I need a halt in my journey. I can pay up to 1000 for this flight ticket. 
 agent: Please hold on for a while, I will check the availability of flights and revert to you. 
 customer: Sure, take your time. 
 agent: Thank you for your time. 
 customer: Ok. 
 agent: Unfortunately, there were no flights available with your specified requirements. 
 customer: Not an issue. Thank you for your kind information. 
 agent: Thank you for approaching us.
Output:
no_flight